The document summarizes a 6-week industrial training at Doordarshan Kendra in Jalandhar, India. It describes the various departments within the station including the studios, ENG section, computer section, OB van, earth station, and transmitter. It provides details about the equipment used in production control rooms and studios for switching, lighting, audio mixing and more. The training aimed to provide knowledge of transmission of channels at the station.

1. TRAINING REPORT
OF
SIX WEEKS INDUSTRIAL TRAINING,UNDERTAKEN
AT
DOORDARSHAN KENDRA,JALANDHAR
ON
“TRANSMISSION OF CHANNEL”
SUBMITTED IN PARTIAL FULFILMENT OF
DEGREE
(“B.E-E.C.E-2012”)
Under the guidance of: Submitted by:
Name : Er. Narendra Singh, (IBES) Name: Himanshu Gupta
Dy. Director Genral(E) B120020114
Chitkara University, Himachal Pradesh

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Certificate of Training
This is to certify that Himanshu Gupta, a candidate of B.E. from Chitkara University,
Himachal Pradesh completed 6 week Industrial Oriented Summer Training program at
Doordarshan Kendra, Jalandhar under my guidance and direction.
Er. Narendra Singh, (IBES)
Dy. Director General (E)
Acknowledgement

3. We are very thankful to all the persons who with their views and participation
helped us to complete this training successfully. It is with pleasure that we find
ourselves penning down these lines to express my sincere thanks to various people to help
me along the way in completing the training.
We wish to express our deep sense of gratitude to Sh.S.K.Bhatiaour Training Co-ordinator
Mr.Jyotinder Singh AE, Mr. Karnbir Singh AE, Mr. B.S.Bhogal and
other staff member from different departments at Doordarshan Kendra Jalandharfor
their able guidance and useful suggestions, which helped us in completing the
Training.
Lastly, we would like to thank the almighty and our parents for their moral support
and our friends with whom we shared our day-to-day experience and received lots
of suggestions that improved our quality of work.
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Preface

4. This report is a brief introduction about Doordarshan, enclosing the topics that deal with all
types of applications & with various aspects related to new researches. I hope, this report will
be extremely expedient for grasping the basis knowledge of various fields of communication.
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Contents
Sr. No. Topic Page No.
I Company Profile……………………………………………..6
Prasar Bharti ………………………………………………….6
Doodarshan kendra Jalandhar…………………………………6-7
DD Punjabi……………………………………………………7
II Introduction………………………………………………......8
III Description…………………………………………………....9
III.1 Studio……………………………………………………….....9-24
III.2 ENG……………………………………………………………25-32
III.3 NLE…………………………………………………………....33-34
III.4 Computer section……………………………………………..35-36
III.5 OB……………………………………………………………..37-38
III.6 Earth Station…………….……………………………………..39-45
III.7 Transmitter…………………………………………………….46-56
IV Industry Applications………………………………………. 57
V Future Enhancements………………………………………..58
VI Conclusions…………………………………………………....59
VII Bibiliography………………………………………………….60

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I. Company Profile
I.1 Overview
Prasar Bharti
Prasar Bharti is India's largest public broadcaster. It is an autonomous body set up
by an Act of Parliament and comprises Doordarshan television network and All
India Radio which were earlier media units of the Ministry of Information and
Broadcasting.
The major objectives of the Prasar Bharati Corporation as laid out in the Prasar
Bharati Act, 1990 are as follows:
 To uphold the unity and integrity of the country and the values enshrined in
the Constitution;
 To promote national integration;
 To safeguard citizens’ rights to be informed on all matters of public interest
by presenting a fair and balanced flow of information;
 To pay special attention to the fields of education and spread of literacy,
science & technology;
 To create awareness about women’s issues and take special steps to protect
the interests of children, aged and other vulnerable sections of the society;
 To provide adequate coverage to diverse cultures, sports and games and
youth affairs;
 To promote social justice, safeguarding the rights of working classes,
minorities and tribal communities.
 To promote research and expand broadcasting faculties & development in
broadcast technology.
DOORDARSHAN KENDRA JALANDHAR
Doordarshan Kendra, Jalandhar also referred as Jalandhar Doordarshan is an Indian
television station in Jalandhar, owned and operated by state-owned Doordarshan,
the television network of Prasar Bharati (Broadcasting Corporation of India). It was
established in 1979, and now produces and broadcasts the 24-hour Punjabi

7. language TV channel, DD Punjabi, which was launched in 1998 and covers most of
the state of Punjab, India
The transmission was initially limited to few hours in a day. Besides the regional
language Punjabi, some programmes in Hindi and Urdu were also telecast. Even
programmes in Haryanvi and Himachali languages were telecast from this Kendra
as these states did not at that time have their own Kendras.
With the introduction of Regional Language Satellite Services, all regional centers
of Doordarshan started generating programmes in their respective regional
languages. And thus, DD Punjabi came into existence along with many other
channels of Doordarshan. A satellite earth station built at the cost of 82.5 million
(US$1.4 million), was inaugurated at the station on 7 August 1998, to allow Punjabi
language programs broadcasted from the station, available to neighboring countries
like Pakistan, Afghanistan, Oman, Qatar and Nepal.
DD PUNJABI:Presently, Doordarshan Kendra, Jalandhar telecasts its
programmes under the brand name DD Punjabi. DD Punjabi Channel was launched
in 1998, and it became a 24-hour service within two years. In its terrestrial mode
DD Punjabi has near 100 per cent reach in the State of Punjab. Besides that,
numerous Punjabi viewers residing in different parts of India watch the cultural
programmes broadcast on DD Punjabi with interest.
I.2 Present Status
Doordarshan Jalandhar is the only Programme Production Center in the Jalandhar.
The Studios are housed at Mahavir Marg, Jalandhar and the transmitter is located at
Kharla Khangra. As per the census figure of 2001, the channel covers 89% by
population and 92% by area of Punjab. On 1st May 1995 telecast of DD2
programmes commenced from Jalandhar using a 100W LPT. Now DD2 converted as
DD NEWS is being telecast from 10KW HPT set up in 2000.The reach of News
channel is 45% by area and 67% by population. Presently Kendra originates over
4hrs of daily programmes (25 hrs. & 30 mins weekly).This Kendra originates 2 news
bulletins daily 1 at 5:00 P.M .
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II. Introduction
DDK Jalandhar has the following main departments which manage
the production, storage transmission and maintenance of the two DD
National channels and the DD Punjabi channel.
1. STUDIO (PCR,CAR, Studio A,B,C)
2. ENG Section (VCR , ENG Camera , Editing Booths)
3. NLE/CS( Computer Section, NLE’s & Server Graphics)
4 . OB
5 . DIGITAL EARTH LINK STATION
6 . TRANSMITTER
Each of these departments are discussed in detail with due stress to therelevant
engineering aspects.

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III. Description
III.1 Studio
The studio constitutes:
III.1.1 Studios A,B,C:Doordarshan Kendra, Jalandhar have three main studios named Studio
A, Studio B, Studio C.Each Studio has got its own PCR Room over it. PCR stands for
Programme Control Room.
Requirement of TV studios are:-
- Very efficient air conditioning.
- Uniform and even flooring for smooth operation of camera
- Effective communication facilities.
- Acoustic Treatment
- Studio cameras as per requirement
- Cyclorama and Curtain
- A/V monitoring facilities
- Studio warning lights, safety devices, fire lighting equipment etc.
- Digital equipment.
- Digital Clock.
Hardware provided in Studio Area is:-
- Monitoring facilities for all inputs and output sources.
- Remote control for video mixer an special effects
- Communication facilities with technical area and studio
floor.
- Vision mixing and switching
- Computer Graphics
- SPG
- CCU
- Light control
- Audio Mixing and control
- Monitoring facilities for I/O audio

10. Studio A
Studio is the largest studio of Doordarshan Kendra, Jalandhar. This studio is mainly
used to shootthe very renowned programmes likeLishkara, Star-Nite, Sur Sangam,
etc.Studio A consists of 34 lights to control the lighting system and all systems in
studio A are operated manually by worker there.
Studio B
Studio B is multipurpose studio. It is used for shooting various programmes like
sajjari saver , hello doordarshan , krishi darshn , and all discussions Studio B has got
two PCR rooms and 12 Lights over it and one man to control all this.
Studio C
Studio C is the smallest studio of Doordarshan Kendra Jalandhar. This Studio Mainly
used to telecast New Bulletin. Doordarshan Kendra, Jalandhar Telecast News From
regional channel twice a day i.e. 5:00 PM and 7:00 PM.
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The output of studio A is continuously checking out at PCR
Lighting system in studio Lighting for television is very exciting and needs creative
talent there is always a tremendous scope for doing experiment to achieve the
required effect . Light is a kind of electromagnetic radiation with a visible spectrum
from red to violet i.e. wavelength from 700 nm to 3800 nm respectively.
Color temperature of various sources
Sum light 5600 K
Studio lamp 3200 K
Domestic lamp 2780 K
Fire 1930 K
Fluroscent 6500 K
Cloudy day 6500 K
Clear Blue sky 12000 K

11. III.1.2. PCR:The PCR stand for Production Control Room. The PCR is where the
post production activities like minor editing and management of feed during a live
program takes place. The production manager sits in the PCR and directs the camera
men and selects the angles sound parameters etc during the production stage in the
PCR. It is in the PCR that we can control all the studio lights and all the microphones
and other aspects. The PCR has a vision mixer and an audio mixer. Its working and
other aspects are discussed in detail in the following pages. The PCR is where the
phone in console and other systems are also kept. The PCR usually of the various
equipments like:-
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•Camera Control Unit(CCU)
•Vision Mixer(VM)
•Video Tape Recorder(VTR)
•Audio Mixer(AM)
III.1.2.1 Camera control unit or CCU: It is in the studio that all aspects related to
the production of a video takes place. The Camera Control Unit is typically part of
a live television broadcast "chain". It is responsible for powering the professional
video camera, handling signals sent over the camera cable (multicore
cable, triax or fiber) to and from the camera, and can be used to control various
camera parameters such as iris remotely. The CCU contains control for
 Aperture
 Optical Focus
 Zoom of the lens system
 Beam Focus
 Selecting Gain
 Color Temperature
 Contours (Camera Details)
 Gamma

12. III.1.2.2 Vision Mixer (VM):A vision mixer or video switcher enables the program
producer to select the desired sources or a combination of the sources in order to
compose the program. The vision mixer is typically 10x6 or 20x10 crossbar
switcher selecting any one of the 10 or 20 input sources to 6 to10 different output
lines. The input sources include: Camera-1, Camera-2, Camera-3, Telecine-1,
Telcine-2, VTR-1, VTR-2, Test Signal etc. The vision mixer provides the following
operational facilities for the editing of the TV programs.
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 Take –selection of any input
source, or cut-switching cleanly
from one source to another.
 Dissolve-fading in or fading out
 Lap Dissolve-dissolving from one
source to another with an overlap
mixing.
 Superposition of two sources-keyed
caption when the selected inlay is superposed on the background picture

13. Mix:A mix is a transition from one picture to another where the new picture fades in as the
existing picture fades out. During a standard mix transition a superimposition of both
pictures, each at a lower intensity, is visible.
Wipe:A wipe is a transition from one picture to another in which the edge of a shape moves
across the screen, revealing the new picture. Wipe transitions can be applied to background,
to keys, or to both simultaneously. A wipe transition shape can be selected from a variety of
patterns, and these patterns can be adjusted in several ways (position, aspect ratios, edge
attributes, etc.).
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Keying:
Keying inserts part of one picture into another to create a composite picture.
Keying involves three signals:
• Background,
• Key cut, used to specify where to cut a hole in the background, and
• Key fill, used to fill the hole in the background.
The fill can be an incoming video signal or it can be an internally generated matte fill. A
separate key cut input signal is not necessarily required for keying. For example, a self key
(also called a video key) uses the same input signal for both key cut and key fill.
The KayakDD system supports the following types of keys:
• Additive Key
• Luminance Key
• Linear Key
• Chroma Key
• Preset Pattern
The KayakDD system also supports self keys and split keys.
Examples of Keying Techniques:
Fig: Matte fill luminance keying

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Fig: Linear Keying
Fig: Luminance Keying and Self Key

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Fig: Chroma Keying
Fig: Preset Key

16. III.1.2.3. VTR: The VTR is the next section where copies of all programs are stored.
All the programs shot in the camera are simultaneously recorded in the VTR. Also
the VTR plays back all the videos as and when required. Videos of pre-recorded
events are queued up in the VTR and are played back without a break. Videos of
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famous people and important events are stored in the central film pool.
III.1.2.4. Audio Mixer: In professional audio, a mixing console, or audio mixer, also called
a mixing desk, audio production console, soundboard or simply mixer is an electronic device
for combining (also called "mixing"), routing, and changing the level, timbre and/or
dynamics of audio signals. A mixer can mix analog or digital signals, depending on the type
of mixer. The modified signals (voltages or digital samples) aresummed to produce the
combined output signals.Mixing consoles are used in many applications, including recording
studios, public address systems, sound reinforcement systems,broadcasting, television,
and film post-production. An example of a simple application would be to enable the signals
that originated from two separate microphones (each being used by vocalists singing a duet,
perhaps) to be heard through one set of speakerssimultaneously. When used for live
performances, the signal produced by the mixer will usually be sent directly to an amplifier,
unless that particular mixer is "powered" or it is being connected to powered speakers.
Among the highest quality bootleg recordings of live performances are the so-called
soundboard recordings that are sourced from this mixer output to the speakers.

17. III.1.3. CAR:In broadcast facilities, a Central Apparatus Room (CAR, pronounced
"C-A-R"), central machine room, or central equipment room (CER), or central
technical area (CTA), or rack room is where shared equipment common to all
technical areas is located. Some broadcast facilities have several of these rooms. It
should be air-conditioned, however low-noise specifications such as acoustical
treatments are optional.This is the nerve centre for the TV station, the main activities
in this area include
 Distribution of stabilized power supply to different technical area with
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protection.
 Sync pulse generation and distribution.
 Video processing and routing.
 Monitoring facilities.
 Patch panel for Audio/Video
 Electronics for switchers and cameras
 Electronics for OFC Link.
 Electronics for STL/ Micro wave Link.
 Receiving of External/ OB Signal and its distribution.
Main equipments in CAR are
Antenna Tracking System: An antenna tracking system tracks a primary antenna to
follow a moving signal source, such as a communication satellite. A secondary
antenna has a greater beam width than the primary antenna and receives the
same tracking signal from the satellite. The primary antenna is tracked according to a
predetermined search pattern which causes a variation in the signal
amplitudedepending upon the relative location of the satellite and the antenna
position.

18. Audio Router:Used for transporting audio signals from inputs to outputs. The
number of inputs and outputs varies dramatically. The way routers are described is
normally number of inputs by number of outputs e.g. 2x1, 256x256. The type of
signals transported - switched can be analogue - Analog - audio signals
or Digital. Digital audio usually is in the AES/EBU standard for broadcast use.
Broadband routers can route more than one signal type e.g. analogue or more than
one type of digital. Because any of the inputs can be routed to any output, the
internal arrangement of the router is arranged as a number of crosspoints which can
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be activated to pass the corresponding signal to the desired output.
Character Generator:A character generator, often abbreviated as CG, is a device or
software that produces static or animated text (such as news crawls and credits rolls)
for keying into a video stream. Modern character generators are computer-based, and
can generate graphics as well as text. (The integrated circuit, usually in the form of
a PROM, that decodes a keystroke in a keyboard, and outputs a corresponding
character, is also referred to as a "character generator.
Hardware Character Generators:Hardware character generators are used
in television studios and video editing suites. A desktop publishing-like interface can
be used to generate static and moving text or graphics, which the device then
encodes into some high-quality video signal, like digital Serial Digital
Interface (SDI) oranalog component video, high definition or even RGB video

19. Software Character Generators:Software CGs run on standard off-the-shelf
computer hardware and are often integrated into video editing software such as non-linear
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editing system (NLE)
Encoder:An encoder is a device, circuit, transducer, software program, algorithm or
person that converts information from one format or code to another, for the
purposes of standardization, speed, secrecy, security, or compressions.
 A compressor encodes data (e.g., audio/video/images) into a smaller form
 An audio encoder may be capable of capturing, compressing and converting
audio
 A video encoder may be capable of capturing, compressing and converting
audio/video
Optical Fibre: An optical fiber (or optical fibre) is a flexible, transparent fiber made
of high quality extruded glass (silica) or plastic, slightly thicker than a human hair. It
can function as a waveguide, or “light pipe”, to transmit light between the two ends
of the fiberOptical fibers are widely used in fiber-optic communications, which
permits transmission over longer distances and at higher bandwidths (data rates) than
other forms of communication. Optical fibers typically include
transparent core surrounded by a transparent cladding material with a lower index of
refraction. Light is kept in the core by total internal reflection. This causes the fiber
to act as a waveguide.
Transceiver: A transceiver is a device comprising both a transmitter and
a receiver which are combined and share common circuitry or a single housing.
When no circuitry is common between transmit and receive functions, the device is a
transmitter-receiver.
Sync Pulse Generator: A sync pulse generator is a special type of generator which
produces synchronization signals, with a high level of stability and accuracy. These

20. devices are used to provide a master timing source for a video facility. The output of
an SPG will typically be in one of several forms, depending on the needs of the
facility:
 A continuous wave signal
 In standard-definition applications, a bi-level sync signal, often with a color
burst signal in facilities that have analog equipment. Typically, this is either in
NTSC or PAL format. As the resulting signal is usually in distinguishable from an all-black
television signal of the same format, this sort of reference is commonly
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known as black or black burst
 .In some high-definition applications, a tri-level sync signal is used instead.
This signal is virtually identical to the synchronization signal used in component
analogue video (CAV); and is similar to the synchronization signals used in
VGA (the main difference being, in VGA the horizontal and vertical syncs
are carried on different wires; whereas TLS signals include both H and V
syncs)
Waveform monitor: A waveform monitor is a special type of oscilloscope used
in television production applications. It is typically used to measure and display the
level, or voltage, of a video signal with respect to time.
The level of a video signal usually corresponds to the brightness, or luminance,
of the part of the image being drawn onto a regular video screen
at the same point in time. A waveform monitor can be used to display the overall
brightness of a television picture, or it can zoom in to show one or two individual
lines of the video signal. It can also be used to visualize and observe special signals
in the vertical blanking interval of a video signal, as well as the colorburst between
each line of video.
Procedure in recording
1. Set is designed in studio as per conceptual thought of program producer.
2. Lighting, Audio and placement of the cameras is arranged as per floor Plan.
3. Pre testing of cameras, microphones, VCRs etc. is done before recording.

21. 4. Recording begins and desired camera/mike are selected through VM/Audio
console as per command of producer. Program is recorded on VCR.
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Procedure in Transmission
1. The programs are transmitted as per the daily cue sheet.
2. After getting D-link caption from Delhi end program is played from VCR/Server.
The program is uplinked by Earth Station.
3. During our slot, both live as well as recorded programs are transmitted.
Video Signal Generation Video is nothing but a sequence of pictures. The image we
see is maintained in our eye for 1/16th sec. So if we see images at the rate more than
16 pictures per second, our eyes cannot recognize the difference and we see the
continuous motion. In movie camera and Movie projector it is found that 24 fps
(frames per second) is better for human eyes. TV system could use this rate but in
PAL system 25 fps is selected. In TV cameras image is converted in electrical signal
using photosensitive material. Whole image is divided into many micro particles
known as pixels. These Pixels are small enough so that our eyes cannot recognize
pixels and we see continuous image. Thus ,at any particular instance there are almost
infinite numbers of pixels that need to be converted in electrical signal
simultaneously for transmitting picture detail . However this is not possible practical
because it is no feasible to provide a separate path for each pixel. In practice this
problem is solved by method known as scanning in which information is converted
one by one pixel. Line by line and frame by frame.
Basic Block Diagram of a TV studio chain

22. Video Chain
The video we see at our home is either pre-recorded in the studio or live telecasted.
Block diagram illustrates different chains of video recording, video playback, news
and live broadcasting. In first chain we will understand studio program recording. In
first chain we will understand studio program recording. Camera output from the
studio hall is to CCU where many parameters of video signals are controlled. Output
signal of CCU after making all corrections is sent to VM in PCR-1 (production
control room). Output of 3 to 4 cameras comes here and final signal is selected here
using VM according to a director’s choice.
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Typical Video and Audio Source Chain
Sources
Vision
Mixer
LOGO
Generator
Earth station
through
Optical Fibre
Distributor
STL
Link
Sources
Audio
Console
Distributor
STL
Link
Earth station
through
Optical Fibre
Analog to AES
Convertor

23. The final signal from VM is sent to VTR. VTR uses both analog and digital tape
recording system. At time transmitting this prerecord program cassettes is played in
to respective in VTR room .Signal from VTR is sent to PCR-2.PCR-2 has one VM,
video monitoring system, a CG (Computer graphics). From PCR-2, signal travels
from MSR to transmitter or earth station for terrestrial and satellite transmission.
MSR is the main control room between studio and transmitter or receiver.
Audio Chain In studio program, Audio from studio microphones is directly fed to
the AUDIO CONSOLE placed in PCR-1. It is used to mix the audio from different
sources and maintained its output. From AC, signal is directly recorded on tape with
video signal in VTR. While playing back audio is extracted from tape and fed to
another audio console placed in PCR-2 and then travels with the video signal.
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Schematic of Signal Transmission Through OB VAN and Studio
Synergy Video Switcher
- Complete control panel
- Serial digital inputs and output
- Full MLE effect systems
- Pattern generator which is used for wipe transitions
- Chroma keying
-12 untimed aux bus,each of which can be used to route video to monitor
-Clean feed features provides a second PGM output
- Display and indicators

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- Digital reference
- Downstream key facility
- Redundant power.
III.2 Electronic News Gathering
Electronic news-gathering (ENG) is a broadcast news industry description
of television producers, reporters and editors making use of electronic video and
audio technologies for gathering and presenting news. Recording and reporting
events and activities as they happen is what news is all about.
The various equipments used in ENG section are:
 ENG Camera
 Camcorder
 VCR
 Editing Booths
III.2.1ENG camera:The Electronic News Gathering (ENG) video camera
replaced 16mm motion-picture film for television news in the mid-1970s. The ENG
cameras are automated and fully operational within a few seconds after they are
switched on. You can make adjustments to extreme production situations quickly
and easily. Most ENG cameras weigh between six and 20pounds, depending
on the number of pickup tubes inside the camera. They are powered by batteries, but
you may also run them from AC current
using an adapter. Recording is to a
professional medium like some variant
of Betacam or DVCPRO or Direct to
disk recording or flash memory. If as in
the latter two, it's a data recording, much
higher data rates (or less video
compression) are used than in consumer devices.All settings, white balance, focus,
and iris can be manually adjusted, and automatics can be completely disabled.

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III.2.1.1. Parts of SONY Digital HD Video Camera RecorderNX5M
1. Hook for shoulder strap
2. ASSIGN /EXPANDED FOCUSbutton
3. Accessory shoe mount
4. Microphone fixing clamper
5. Microphone holder
6. Microphone
7. Accessory shoe
8. TC LINK switch
9. TC LINK IN/OUT jack
10. Zoom lever
1. Lens
2. Lens hood with lens cover
3. Internal microphone
4. The recording lamp flashes if theremaining capacity of recording media or
battery is low.
5. Remote sensor
6. ASSIGN 4/ZEBRA button
7. ASSIGN 5/AE SHIFT button*
8. ASSIGN 6/VISUAL INDEX button

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9. CH1 (INT MIC/INPUT1) switch
10. AUTO/MAN (CH1) switch
11. AUDIO LEVEL(CH1) dial
12. AUDIO LEVEL(CH2) dial
13. AUTO/MAN (CH2) switch
14. CH2 (INT MIC/INPUT1/INPUT2)switch
15. ASSIGN 1/2*/3 buttons
16. PUSH AUTO button
17. FOCUS switch
18. ND filter
1. VIDEO OUT jack/AUDIO OUT jacks
2. COMPONENT OUT jack
3. HDMI OUT jack
4. USB jack
5. SDI OUT jack
6. RELEASE lever
7. Handle zoom lever
8. Handle record button
9. INPUT2 jack
10. INPUT1 jack
11. Cable holder Provided for securing a microphonecable, etc.
12. INPUT2 switch
13. INPUT1 switch
14. REMOTE jack-The REMOTE jack is used for controlling playback, etc. on the video
device and peripherals connected to it.
15. Grip belt
16. POWER switch
17. Record button
18. Flash memory unit mount -For attaching a flash memory unit.
19. GPS switch (HXR-NX5E/NX5P)-When it is set to ON, the camcorder acquires the
GPS information (location and time of recording) and records with images.

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III.2.1.2.Camera Optics:
1. LENS
 Focus Section
 Zoom Section
 Servo Drive Assembly
 Aperture Section Drive
 Back Foucs & Micro Focus
2. OPTICAL BLOCK
 Color Filter Wheels
 Prism & Dichroic Mirror
 Bias light and a Suitable Lens Mount
3. TRANSDUCER OR PICK UP DEVICE
Types:
 Photo emissive device
 Photo conductive device
 Charge coupled device

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4. CAMERA ELECTRONICS
III.2.2 Camcorder:A camcorder (formally a video camera recorder) is an electronic
device that combines a video camera and a video recorder into one unit; typically for
out-of-studio consumer video recordingIn older analog camcorders, the imaging
device was based on vacuum tube technology where the charge on a light sensitive
target was in direct proportion to the amount of light striking it. Newer analog and
all digital camcorders use a solid state Charge Coupled Device (CCD) imaging
device, or more recently a CMOS imager. Both of these latter devices use
photodiodes that pass a current proportional to the light striking them (i.e. they are
analog detectors), but that current is then digitised before being electronically
'scanned' before being fed to the imager's output. The principal difference in the
latter two devices is in the manner in which that 'scanning' is accomplished. In the
CCD, the diodes are all sampled simultaneously, and the scanning then achieved by
passing the digitised data from one register to the next (the Charge Coupled
element). In the CMOS device the diodes are sampled directly by the scanning logic.
III.2.3. VCR:The Video Cassette Recorder (or VCR, also known as the video
recorder) is an electro-mechanical device that records analog audio and analog
video from broadcast television on a removable, magnetic tape videocassette, so that
the images and sound can be played back at a more convenient time. This use of a
VCR is commonly referred to as television program Timeshifting.

30. III.2.3.1. Parts of PANASONIC Digital Video Cassette Recorder AJ-965p
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DVCPRO50

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Front Panel
1. Power swtich
2. Format Display Area
3. Remote Button
4. Super Switch
5. REC INH Switch
6. TCG Switch
7. MODE Switch
8. Cassette Insertion Slot
9. Eject Button
10. Play Button
11. REC Button
12. Stop Button
13. FF Button
14. REW Button
15. EDIT Button
16. STAND BY Button

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Rear Panel
1. AC IN socket
2. DIGITAL AUDIO IN and OUT connectors
3. ANALOG COMPONENT VIDEO IN connectors
4. ANALOG COMPOSITE VIDEO IN connectors
5. REF VIDEO IN connectors and 75 Ω termination switch
6. Remote control connectors
7. ENCODER REMOTE Connectors
8. ANALOG AUDIO IN connectors
9. TIME CODE IN connectors
10. TIME CODE OUT connectors
11. SERIAL COMPONENT AUDIO and VIDEO IN and OUT connectors
12. Fan
13. SIGNAL GND terminal
14. ANALOG COMPONENT VIDEO OUT connectors
15. ANALOG COMPOSITE VIDEO OUT connectors
16. RS-232c connectors
17. PARALLEL REMOTE connector
18. ANALOG AUDIO OUT connector

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19. MONITOR OUT connector
20. Option Connector
III.2.4. Editing booths: In ENG section Linear Editing takes place,Linear video
editing is a video editing post-production process of selecting, arranging and
modifying images and sound in a predetermined, orderedsequence. Regardless of
whether it was captured by a video camera, tapeless camcorder, or recorded in
a television studio on a video tape recorder(VTR) the content must be
accessed sequentially.

34. III.3 Non-Linear Editing:
Non-linear editing enables direct access to any video frame in a digital video clip,
without needing to play or scrub/shuttle through adjacent footage to reach it, as was
necessary with historical video tape linear editing systems. It is now possible to
access any frame by entering directly the timecode or the descriptive metadata.
Video and audio data are first captured to hard disks, video server, or other digital
storage devices. The data are either direct to disk recording or are imported from
another source (transcoding,digitizing, transfer). Once imported, the source material
can be edited on a computer using application software, include fades, transitions,
and other effects that cannot be achieved with linear editing.
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GRASS VALLEY EDIUS NLE :
It is a Linux based Server with NexSan Storage having 12 TB capacity and
havingCAT-5 LAN connection between all systems.It has Fiber Channel Connection
between storage and FC switch and also Fiber Connectivity between FC Switch,
Server & Edit-Workstations.
In Doordarshan Kendra Jalandhar, eight non-linear editing booths are in working
condition
Two kind of operating system are used in NLEs.
1. DPS Velocity (Windows - O.S.)
2. Adobe Premiere (Windows - O.S.)
3. Grass Valley Edius (Windows - O.S.)
4. Final Cut Pro (FCP) (MAC - O.S.)

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DPS Velocity HD: Real-Time:
 HD/SD Non-Linear Editing System
 Multi-Stream SD Editing
 HD/SD Color Correction
 Format Flexibility: 1080i, 1080PsF, 720p
 Compressed or Uncompressed (8/10-bit)Video
 On-Board SCSI for Dual Stream
FINAL CUT PRO:
 64-bit architecture
 Background rendering using GPU and CPU
 Multi-stream real-time effects in SD and HD formats.
 Supports 64-bit third-party Audio / Video plug-ins.
 Audio sample rate up to 192kHz.
Adobe Premiere Pro:
 Supports SD & HD Video formats for direct recording from Camera, Laptop
or Workstation.
 High Quality Slow Motion.
 GPU-accelerated effects to control frame rate, aspect ratio, field order, alpha
channels, pull-down removal, real-time keying, time remapping, transitions
etc.
News NLE:
 Dedicated Velocity 8.2 for News Editing & Playback for Transmission.
 Sharing with FTP client placed at News Room for importing Video clips
from News Stringers directly.

36. III.4. Computer Section:The main objective of this section is the maintainence
of following machines based on computer technology:
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1. Video Loggers
2. ENPS System
3. FTP Server
4. Win Plus & Auto Script Prompter
Video Loggers: The main function of video loggers is to record off-air programs
relayed by DD Punjabi. The video logger available at DDK Jalandhar is having 90
days recording and playback facility.
ENPS system:ENPS (Electronic News Production System) is a software application
developed by the Associated Press's Broadcast Technology division for producing,
editing, timing, organizing and running news broadcasts.
FTP Server: File Transfer Protocol (FTP) is a standard network protocol used to
transfer files from one host to another host over a TCP-based network, such as
the Internet. FTP may run in active or passive mode, which determines how the data
connection is established. In active mode, the client creates a TCP control
connection. In situations where the client is behind a firewall and unable to accept
incoming TCP connections, passive mode may be used. In this mode, the client uses
the control connection to send a PASV command to the server and then receives a
server IP address and server port number from the server, which the client then uses
to open a data connection from an arbitrary client port to the server IP address and
server port number received.
Autoscript Teleprompter:A teleprompter, or autocue, is a display device that
prompts the person speaking with an electronic visual text of a speech or script.
Using a teleprompter is similar to using cue cards. The screen is in front of, and
usually below, the lens of a professional video camera, and the words on the screen
are reflected to the eyes of the presenter using a sheet of clear glass or a specially
prepared beam splitter. Light from the performer passes through the front side of the
glass into the lens, while a shroud surrounding the lens and the back side of the glass
prevents unwanted light from entering the lens.

37. Because the speaker does not need to look down to consult written notes, he appears
to have memorized the speech or to be speaking spontaneously, looking directly into
the camera lens. Cue cards, on the other hand, are always placed away from the lens
axis, making the speaker look at a point beside the camera, which leaves an
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impression of distraction.
(1) Video camera
(2) Shroud
(3) Video monitor
(4) Clear glass or beam splitter
(5) Image from subject
(6) Image from video monitor

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III.5 Outdoor Broadcasting
Outside broadcasting (OB) is the electronic field production (EFP)
of television or radio programmes (typically to cover television news andsports
television events) from a mobile remote broadcast television studio. Professional
video camera and microphone signals come into theproduction truck for processing,
recording and possibly transmission. The mobile production control room (PCR) is
known as a OB van.
A typical OB van is usually divided into five parts:
 Parts of the television crew are located in the first and largest part is the video
production area. The television director, technical director, assistant
director, character generator (CG) operator and television producers usually
sit in front of a wall of video monitors. The technical director sits in front of
the video switcher. The video monitors show all the video feeds from various
sources, including computer graphics, professional video cameras, video tape
recorder (VTR), video servers and slow-motion replay machines. The wall of
monitors also contains a preview monitor showing what could be the next
source on air and a program monitor that shows the feed currently going to
air or being recorded The video switcher is usually operated by one person
called the technical director (TD) and is responsible for switching the video
sources to air as directed. Behind the directors there is usually a desk with
monitors for the editors to operate. It is essential that the directors and editors
are in communication with each other during events, so that replays and
slow-motion shots can be selected and aired. The "production room" in most
sporting events has a graphics operator and sometimes a font coordinator who
are in charge of the graphics, statistics, and the showing of the names of
commentators or the players to be shown on air.
 The second part of a van is where the audio engineer has an audio
mixer (being fed with all the various audio feeds: reporters, commentary, on-field
microphones, etc.). The audio engineer can control which channels are
added to the output and follows instructions from the director. They relay the
information from producers and directors to their A2's who typically set up

39. the audio cables and equipment throughout the arenas and the booth where
the commentators sit. The audio engineer normally also has a dirty feed
monitor to help with the synchronization of sound and video.
 The third part of the truck is the VTR area. The tape area has a collection of
machines including video servers and may also house additional power
supplies or computer equipment. The "tape room" hasLSM operators who
have one or more cameras that go into their machines and can be played back
for replays when an exciting or important play occurs during the game. LSM
operators also play replay rollouts that lead into commercial breaks or show
the highlights of the event at the end of play. These operators also can play
back in slow motion or pause to show a key part of the action.
 The fourth part is the video control area where the professional video
cameras are controlled using camera control units (CCU) by one or
two operators, to make sure that the iris is at the correct exposure and that all
the cameras look the same. These operators can shade, balance, and focus the
cameras from this position inside the truck. This area is controlled by an
operator called a V1 and depending on the size of the show and/or the
broadcast company may have a V2.
 The fifth part is transmission where the signal is monitored by and engineered
for quality control purposes and is transmitted or sent to other trucks. The
transmission is monitored by the truck engineers to ensure the people at home
have a good picture and a high quality signal output.
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III.6 EARTH STATION
The earth station is the link between the terrestrial data sources and the remote
satellite resource. Its most familiar component is the earth station antenna, which
can be tens of meters in diameter or a small portable dish. In addition, there are
numerous, less obvious devices in the chain of devices that transmit or receive the
signal. This article will briefly summarize some of the most important aspects of
earth station operation.
III.6.1 GeographicalPositionof Jalandhar
 Longitude 75* 34’45” East
 Latitude 31*19’32” North
III.6.2. Digital Earth Station:
Digital earth station is basically satellite up-linking station which is broadcasting in
digital mode. The satellite broadcasting has fully migrated from analog to digital
mode world wide. The satellite broadcasting was introduced in late eighties and was
begun with analog broadcasting. The analog video broadcasting occupies full 36
MHz transponder bandwidth for one video service. Doordarshan adopted Digital
Video Broadcasting -Satellite (DVB-S) in Simulcast Mode in the late nineties. In
simulcast mode, analog and digital services are transmitted simultaneously in the
same transponder bandwidth. 27MHz bandwidth was assigned to analog service
while 9 MHz to digital service. Simulcasting helped in smooth migration from
analog to digital. Now the satellite broadcasting is fully digitalized and is popularly
known as Digital Satellite News Gathering, Direct-to-Home, Digital Earth Station.
All major Doordarshan Kendras have Digital Earth Stations which are up-linking one
regional and one national service. 9MHz bandwidth is allotted to each Kendra. Four
Kendra’s are therefore sharing 36MHz bandwidth of a transponder.
At the beginning of nineties, Digital Video Broadcasting (DVB) was created as a
European project. In the course of this project, three transmission methods were
developed: DVB-S (Satellite), DVB-C (cable) and DVB-T (Terrestrial). The satellite
transmission method DVB-S has been in use since about 1995. DVB-S specifies
Quadrature Phase Shift Keying (QPSK) as digital modulation. 8PSK is also
incorporated in DVB-DSNG version of satellite transmission standards.

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Digital Communication setup
III.6.2. Play Back Booth: In play back booth the main purpose is to play the
live programs e.g. the let us take an example of a live program in which we need to
play the songs on the demand of the consumers the all the songs in the list first to be
dumped on a machine , then to be played on demand. Studio connectivity has been

42. provided through OFC via central apparatus room. However coaxial cables has also
been provided as standby to OFCCommand/Communication with studios, CAR and
VTR room etc. has also been provided.
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Main Equipment of play back
 Router ,make Seiravedio system
 DVC (DVC PRO 50,make Panasonic)
 BTS ,make sony, Betacam sp,2800P
 SERVER ,make Leitch
 VISTEK FRAME
(EMD,DEMD,ADC)
 CG (MOVE CG PRO)
III.6.3. Power Supply Distribution at Earth Station
Fig: Block Diagram

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Fig: Implementation
BASEBAND RACK:
 Fiber optic receiver to receive embedded signal
from studio(CAR)
 Signal generator
 Audio level monitor
 Video monitor
COMPRESSION RACK:
 Encoders
 Multiplexers
 Modulators
 Redundancy switch
 NMS
Rx Monitoring Rack

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 UP convertor
 RF power divider
 C to L band Convertor
 I.R.D
 Spectrum Analyzer
HPA Rack
 HPA
 Dehydrator
 Waveguide
Earth Station classification
 Analog Earth Station
 Digital Earth Station
 ASNG
 DSNG
 C-band or Ku-band
Problems of Analog
 One program per channel/transponder
 Comparatively noisy
 Ghosts in Terrestrial Transmission
 Lower quality with respect to VCD, DVD digital medium‡
 Fixed reception
Advantages of digital over analog

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 More programs per channel/Transponder i.e. spectrum efficient.
 Noise-Free Reception.
 Ghost elimination.
 CD quality sound & better than DVD quality picture.
 Reduced transmission power.
 Flexibility in service planning.
Process involved in transmission of signal
 Up-Conversion
 High power amplification
 Transmission
Reception Up-Converters
The up-conversion is required to raise the frequency of the signal in desired band: C- band,
Extended C-band or Ku-band before transmission. The input to up converter is 70 MHz
(output of modulator) and output of Up-converter is fed to HPA.The up-conversion may be
done in stages or in one stage directly. The 70 MHz signal is first converted into L ±band and
then L band signal raised to desired frequency band.
High power amplification
The high power amplifier is used for the final power amplification of the digital RF signal in C-band/
Ku band that is fed to the antenna. The important parameters of HPAs are:
 Frequency range
 Output power at flange
 Bandwidth
 Gain variation (1.0db (max.) for 40 MHz (narrow band)
 2.50db for full bandwidth.
The different types of HPAs are

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 KHPA - Klystron High Power Amplifier
 TWTA -Traveling Wave Tube Amplifier
 SSPA- Solid state Power Amplifier
III.7. TRANSMITTER

47. A television transmitter is a device which broadcasts an electromagnetic signal to
the television receivers. Television transmitters may be analog or digital.
Transmitter station refers to terrestrial infrastructure for transmitting radioa frequency
signals. The station maybe used for wireless communication, broadcasting, microwave
link, mobile telephone or other purposes.
Terrestrial transmission: A transmission from point A to point B that doesn’t make use of
satellites.
If the transmission is straight from point A to point B, then the maximize range it's a bit more
of the horizon (depending on what frequency are you transmitting)
Use of repeaters can extend the range.
LF MF HF VHF UHF are the most common frequencies used for terrestrial communications.
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III.7.1. Broadcast Transmitter
A broadcast transmitter refers to an installation used for broadcasting, including radio
transmitter or television transmitter equipment, the antenna, and often the location of the
broadcasting station. It has following parts:
1. Exciter
2. Power Supply
3. Frequency Control
4. Cooling of final Stages
5. Protection Equipment
III.7.1.1 Exciter
In broadcasting and telecommunication, the part which contains the oscillator, modulator, and
sometimes audio processor, is called the "exciter". Most transmitters use heterodyne principle,
so they also have a frequency conversion units. Confusingly, the high-power amplifier which the
exciter then feeds into is often called the "transmitter" by broadcast engineers. The final output is
given as transmitter power output (TPO).
III.7.1.2 Power Supply

48. Transmitters are sometimes fed from a higher voltage level of the power supply grid than
necessary in order to improve security of supply. For example,
the Allouis, Konstantynowand Roumoules transmitters are fed from the high-voltage network
(110 kV in Alouis and Konstantynow, 150 kV in Roumoules) even though a power supply from
the medium-voltage level of the power grid (about 20 kV) would be able to deliver enough power.
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III.7.1.3 Cooling of final Stages
Low-power transmitters do not require special cooling equipment. Modern transmitters can be
incredibly efficient, with efficiencies exceeding 98 percent. However, a broadcast transmitter with
a megawatt power stage transferring 98% of that into the antenna can also be viewed as a 20
kilowatt electric heater.
For medium-power transmitters, up to a few hundred watts, air cooling with fans is used. At
power levels over a few kilowatts, the output stage is cooled by a forced liquid cooling system
analogous to an automobile cooling system. Since the coolant directly touches the high-voltage
anodes of the tubes, only distilled, deionised water or a special dielectric coolant can be
used in the cooling circuit. This high-purity coolant is in turn cooled by a heat exchanger, where
the second cooling circuit can use water of ordinary quality because it is not in contact with
energized parts.
III.7.1.4 Protective Equipment
The high voltages used in high power transmitters (up to 40 kV) require extensive protection
equipment. Also, transmitters are exposed to damage from lightning. Transmitters may be
damaged if operated without an antenna, so protection circuits must detect the loss of the
antenna and switch off the transmitter immediately.
Lightning protection is required between the transmitter and antenna. This consists of spark
gaps and gas-filled surge arresters to limit the voltage that appears on the transmitter terminals.
In some transmitting plants UV detectors are fitted in critical places, to switch off the transmitter if
an arc is detected.

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Fig:DD1 Exciter
Fig:DD2 Exciter

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III.7.2 Analog transmission
Analog (or analogue) transmission is a transmission method of conveying voice, data, image,
signal or video information using a continuous signal which varies in amplitude, phase, or
some other property in proportion to that of a variable. It could be the transfer of an analog
source signal, using an analog modulation method such as frequency modulation (FM)
or amplitude modulation (AM), or no modulation at all.
III.7.3 Digital transmission
Data transmission, digital transmission, or digital communications is the physical transfer
of data (a digital bit stream) over a point-to-point or point-to-multipoint
communication channel. Examples of such channels are copper wires, optical
fibres, wireless communication channels, storage media and computer buses. The data are
represented as an electromagnetic signal, such as an electrical
voltage, radiowave, microwave, or infrared signal. While analog transmission is the transfer
of a continuously varying analog signal, digital communications is the transfer of discrete
messages.
III.7.4 Transmission
DTTV is transmitted on radio frequencies through terrestrial space in the same way as
standard analog television, with the primary difference being the use of multiplextransmitters
to allow reception of multiple channels on a single frequency range (such as
a UHF or VHF channel) known as subchannels.
The amount of data that can be transmitted (and therefore the number of channels) is directly
affected by channel capacity and the modulation method of the channel. The modulation
method in DVB-T is COFDM with either 64 or 16-state Quadrature Amplitude
Modulation (QAM). In general, a 64QAM channel is capable of transmitting a greater bit
rate, but is more susceptible to interference.
III.7.5 Reception
DTTV is received either via a digital set-top box (STB) or integrated tuner included
with television sets, that decodes the signal received via a standard television antenna. Some
set-top-boxes include digital video recorder (DVR) functionality.

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III.7.6 Basic functioning of Transmitter at Jalandhar
The transmitter tower at Jalandhar currently operates on analog transmission. There are two
transmitters one is VHF and other is UHF. The VHF transmitter is CH#9 used for
transmission is DD NATIONAL channel while the UHF is CH#22 used for telecasting DD
NEWS. Both are of 10kW power.
After receiving the signals of these two channels through satellite, the signals undergo certain
processes. Firstly, audio and video components are separated and fed into exciter. The audio
component is amplified using FM technique and video component is amplified using AM
technique. The signal is amplied using power amplifiers of lower power then combined to
give a amplified signal. This amplified audio and video signal is then passed two the wave
guides. Wave guide is made of copper to reduce the distortions in signal. Then both amplified
audio and video components are recombined maintaining a band difference of 55.5 MHz and
then it is transmitted to the top of tower for telecasting.
III.7.7. Picture Basics :-A television creates a continuous series of moving
pictures on the screen. This sectionwill describe in detail how pictures are created in
a television. A camera works exactly on the same principleapplied the other way
round. A picture is "drawn" on a television or computer display screen by sweeping
an electrical signal horizontally across the display one line at a time. The amplitude
of this signal versus time represents the instantaneous brightness at that physical
point on the display. At the end of each line, there is a portion of the waveform
(horizontal blanking interval) that tells the scanning circuit in the display to retrace to
the left edge of the display and then start scanning the next line. Starting at the top,
all of the lines on the display are scanned in this way. One complete set of lines
makes a picture. This is called a frame. Once
thefirstcomplete picture is scanned, there is another portion of the waveform (vertical
blanking interval, not shown) that tells the scanning circuit to retrace to
thetop of the display and start scanning the next frame, or picture. Thissequence is
repeated at a fast enough rate so that the displayed images are perceived to have
continuous motion. This is the same principle as that behind the "flip books" that you
rapidly flip through to see a moving picture or cartoons that are drawn and rapidly
displayed one picture at a time. Interlaced versus Progressive
ScansThesearetwodifferenttypesof systems.
They differinthetechnique used to cover the area of the screen. Television signals and

52. compatible displays are typically interlaced, and computer signals and compatible
displays are typically progressive (non-interlaced). These two formats are
incompatible with each other; one would need to be converted to the other before any
common processing could be done. Interlaced scanning is where each picture,
referred to as a frame, is divided into two separate sub-pictures, and referred to as
fields. Two fields make up a frame. An interlaced picture is painted on the screen
in two passes, by first scanning the horizontal lines of the first field and then
retracing to the top of the screen and then scanning the horizontal lines for the
second field in-between the first set. Field 1 consists of lines 1 through 262 1/2, and
field 2 consists of lines 262 ½ through 525. The interlaced principle
is illustrated in Figure2. Only a few lines at the top and the bottom of each field are
52 | P a g e
shown.
here are many different kinds of video signals, which can be divided into either
television or computer types. The format of television signals varies from country to
country. In the United States and Japan, the NTSC format is used. NTSC stands
for National Television Systems Committee, which is the name of the organization
that developed the standard. In Europe, the PAL format is common. PAL (phase
alternating line), developed after NTSC, is a n improvement over NTSC. SECAM is
used in France and stands for sequential coleur avec memoire (with memory). It
should be noted that there is atotal of about 15 different sub-formats contained within
these three general formats. Each of the formats is generally not compatible with
theothers. Although they all utilize the same basic scanning system andrepresent
color with a type of phase modulation, they differ in
specificscanning frequencies, number of scan lines, and color modulation
techniques, among others. The various computer formats (such as VGA,XGA, and

53. UXGA) also differ substantially, with the primary difference
inthe scan frequencies. These differences do not cause as mu c h c on c e rn , becaus
e most computer equipment is now designed to handle variable scan rates. This
compatibility is a major advantage for computer formats in that
media, and content can be interchanged on a global basis.
In India we use the PAL system. It has 625 lines in each frame and uses interlaced
VideoFormat NTSC PAL HDTV/SDTV
Description TelevisionFormat
High
Definition/StandardDefinition
DigitalTelevision Format
1080 or 720 or 480;18
different formats
1920 or 704 or 640;18
different formats
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VerticalResolutionFormat
(visiblelines per frame)
HorizontalResolution
Format(visible pixels per
line)
HorizontalRate
(kHz)
Vertical FrameRate
(Hz)
HighestFrequency
(MHz)
scanning
forNorthAmerica
andJapan
TelevisionFormat
forMost of Europe and
South America.Used in
India
Approx 480(525
totallines)
Approx 575(625 total
lines)
Determined
by bandwidth,ranges
from320 to 650
Determined
by bandwidth,ranges
from320 to 720
15.734 15.625 33.75-45
29.97 25 30-60
4.2 5.5 25
There are three basic levels of baseband signal interfaces. In order of increasing
quality, they are composite (or CVBS), which uses one wire pair; Y/C (or S-video),
whichuses two wire pairs; and component, which uses three wire pairs. Each wire
pair consists of a signal and a ground.
Thesethree interfaces differ in their level of information combination. More encoding
typically degrades the quality but allows the signal to be carried on fewerwires.
Component has the least amount of encoding, and composite the most.

54. Composite/CVBS Interface
Composite signals are the most commonly used analog video interface.Composite vi
deo is also
referred to as CVBS, which stands for color,video, blanking, and sync, orcomposite
video
baseband signal. Itcombines the brightness information (luma), the color information
( chroma ), and the synchronizing signals on just one cable. The connector is
typically an RCA jack. This is the same connector as that used for
standardline level audio connections.
It is possible to obtain any desired colour by mixing three primarycolours i.e., red,
blue and green in suitable proportion.
The figure 10 shows the effect of projecting red, green, blue beams of light so that
they overlapon screen.Y = 0 . 3 R e d + 0 . 5 9 G r e e n + 0 . 1 1 B l u e
54 | P a g e
The Colour Television
Thus it isonly required to convert optical information of these three coloursto
electrical signals and transmit it on different carriers to bedecoded by the
receiver. This can then be converted back to theoptical image at the picture
tube. The phosphors for all the threecolours i.e. R, G and B are easily available to the

55. manufacturers of the picture tube. So the pick up from the cameras and output forthe
picture tube should consists of three signals i.e. R, G and B. Itis only in between the
camera and the picture tube of the receiverwe need a system to transmit this
information.Colour television has the constraint of compatibility and
reversecompatibility with the monochrome television system whichmakes
it slightly complicated. Compatibility means that whencolour TV signal is radiated
the monochrome TV sets should alsodisplay Black & White pictures. This
is achieved by sending Y asmonochrome information along with
the chroma signal. Y isobtained by mixing R,G & B as per the well known equation :
Y= 0 . 3 R + 0 .59 G + 0.11 BReverse compatibility means that when Black &
White TV signal
isradiated the colour TV sets should display the Black & Whitepictures
55 | P a g e
Some important terms and their meanings in this context are listed below:
Aspect Ratio
Aspect ratio is the ratio of the visible-picture width to the height. Standard
television andcomputers have an aspect ratio of 4:3(1.33). HDTV h a s aspects
ratios of either 4:3 or 16:9(1.78). Additional aspect ratios like 1.85:1or 2.35:1 are
used in cinema.
Banking intervals
There are horizontal and vertical blanking intervals. Horizontal blanking interval is
the time period allocated for retrace of the signal from the right edge of the display
back to the left edge to start another scan line. Vertical blanking interval is the time
period allocated for retrace of the signal from the bottom back to the top to start
another field or frame. Synchronizingsignals occupy a portion of the blanking
interval.
Blanking Level
Used to describe a voltage level (blanking level). The blanking level is thenominal
voltage of a video waveform during the horizontal and vertical periods, excluding the
more negative voltage sync tips
.
Chroma

56. The color portion of a video signal. This term is sometimes
incorrectlyreferred to as "chrominance," which is the actual displayed color informat
ion.
Color Burst
The color burst, also commonly called the "color subcarrier," is 8 to 10cycles of the
color reference frequency. It is positioned between the risingedge of sync and
the start of active video for a composite video signal.
Fields and Frames
A frame is one complete scan of a picture. In NTSC it consists of 5 2 5 horizontal
scan lines. In interlaced scanning systems, a field is half of aframe; thus, two fields
make a frame.
Luma
The monochrome or black-and-white portion of a video signal. This term is
sometimes incorrectly called "luminance," which refers to the actualdisplayed
brightness.
Monochrome
The luma (brightness) portion of a video signal without the c o l o r information.
Monochrome, commonly known as black-and-white, predatescurrent color
television.
PAL
Phase alternate line. PAL is used to refer to systems and signals that are compatible
with this specific modulation technique. Similar to NTSC butuses subcarrier phase
alternation to reduce the sensitivity to phase errors thatwould be displayed as color
errors. Commonly used with 626-line, 50Hzscanning systems with a subcarrier
frequency of 4.43362MHz.
Pixel
Picture element. A pixel is the smallest piece of display detail that has aunique
brightness and color. In a digital image, a pixel is an individual
pointin the image, represented by a certain number of bits to indicate the brightness.
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57. RGB
Stands for red, green, and blue. It is a component interface typically used incomputer
graphics systems.Sync Signals/PulsesSync signals, also known as sync pulses, are
negative-going timing pulses invideo signals that are used by video-processing
or display devices tosynchronize the horizontal and vertical portions of
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the display.
Y Cr Cb
A digital component video interface. Y is the luma (brightness) portion, andCr and
Cb are the color-difference portions of the signal.
Y/C
An analog video interface in which the chroma (color) information is
carriedseparately from the luma (brightness) and sync information. Two wire
pairsare used, denoted Y and C or Y/C. Often incorrectly referred to as "S-video.

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IV. Industry Applications
1. Doordarshan has a three tier programme service – National, Regional and
Local.
2. The emphasis in the National programmes is on events and issues of interest
to the entire nation.
3. These programmes include news and current affairs, magazine programmes
and documentaries on science, art and culture, environment, social issues,
serials, music, dance, drama and feature films.
4. The regional programmes are beamed on DD National at specific times and
also on the Regional Language Satellite Channels, catering to the interests of
a particular state, in the language and idiom of that region.
5. The local programmes are area specific and cover local issues featuring local
people.

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V. Future Enhancements
Doordarshan has completed its objective of providing information related to
the every field of daily life to the common man time to time. Whether
Doordarshan kendra Jalandhar is having analog transmission till now. But,
with the each passing day it is moving towards the betterment whether in the
form of digitiztion or in the form of stepping towards HDTV from SDTV.

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VI. Conclusions
The technology currently in use at Prasar Bharati has improved significantly. At this stage
there has been advancement in signal reception quality as systems are changing from
analog to digital with the advancement in different audio and video compression
techniques. For Doordarshan, DTH (Direct To Home Service) satellite services have
become more user friendly and also evolution of SDTV into HDTV have made it a popular
product among the people of India. It is also accessible from remote areas with more
channel and better reception.

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VII. Bibliography
1. http://en.wikipedia.org/wiki/
2. http://prasarbharati.gov.in/
3. Antennas & Propagation,CS 6710, Spring 2010, Rajmohan Rajaraman
4. Electromagnetic Radiations and antennas, whites EE 382
5. Transmission Techniques for Digital Terrestrial TV Broadcasting By
Hikmet Sari, Georges Karan and Issabelle Jeanclaude