The document discusses different types of amplitude modulation (AM) including:
1) Double sideband AM which produces a signal with power at the carrier frequency and two adjacent sidebands, each equal in bandwidth to the modulating signal.
2) Single sideband modulation which completely suppresses either the carrier or one sideband, improving bandwidth efficiency at the cost of increased complexity.
3) On-off keying AM which represents binary data as the presence or absence of a carrier wave, commonly used to transmit Morse code.
The modulation index measures the extent of amplitude variation around the unmodulated carrier level, relating the variation in carrier amplitude to avoid distortion.
In this presentation, we tried our best to explain the two basic types of Modulation that are Amplitude modulation and Frequency modulation. We hope you find this PPT useful.
In this presentation, we tried our best to explain the two basic types of Modulation that are Amplitude modulation and Frequency modulation. We hope you find this PPT useful.
Modulation
In the modulation process, some characteristic of a high-frequency carrier signal (bandpass), is changed according to the instantaneous amplitude of the information (baseband) signal.
Comparative Study and Performance Analysis of different Modulation Techniques...Souvik Das
Make a comparative study and performance analysis of different modulation
techniques which shows graphically and comparatively results like Bandwidth,
Energy and Power Efficiency of AM, DSB-SC, SSB and SSB-SC
This is all about MODULATION, AMPLITUDE MODULATION, AND AM DEMODULATION, Techniques
By_ IMTIAZ ALI AHMED
B.Tech Student
Siliguri Institute of Technology(ECE)
ALTITUDE. Vertical distance of an aircraft or object above a given reference, such as ground or sea level.
AMPLIFIER. An electronic device used to increase signal magnitude or power.
AMPLITUDE MODULATION (AM). A method of impressing a message upon a carrier signal by causing the carrier amplitude to vary proportionally to the message waveform.
ANTENNA SYSTEM. Routes RF energy from the transmitter, radiates the energy into space, receives echoes, and routes the echoes to the receiver.
A presentation prepared by my friend's friend. I have done no editing at all, I'm just uploading the presentation as it is.
RF Carrier oscillator
To generate the carrier signal.
Usually a crystal-controlled oscillator is used.
Buffer amplifier
Low gain, high input impedance linear amplifier.
To isolate the oscillator from the high power amplifiers.
Modulator : can use either emitter collector modulation
Intermediate and final power amplifiers (pull-push modulators)
Required with low-level transmitters to maintain symmetry in the AM envelope
Coupling network
Matches output impedance of the final amplifier to the transmission line/antenn
Applications are in low-power, low-capacity systems : wireless intercoms, remote control units, pagers and short-range walkie-talkie
Modulating signal is processed similarly as in low-level transmitter except for the addition of power amplifier
Power amplifier
To provide higher power modulating signal necessary to achieve 100% modulation (carrier power is maximum at the high-level modulation point).
Same circuit as low-level transmitter for carrier oscillator, buffer and driver but with addition of power amplifier
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Session Overview
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Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024
Am5
1. NATIONAL COLLEGE OF SCIENCE AND TECHNOLOGY
Amafel Bldg. Aguinaldo Highway Dasmariñas City, Cavite
Assignment # 2
AMPLITUDE MODULATION
(Types of Amplitude Modulation)
(Power in Amplitude Modulation)
(Modulation Index)
Alido, Ronald June 29,2011
Communications 1 / BSECE 41A1 Score:
Eng'r. Grace Ramones
Instructor
2. Amplitude Modulation
Varying the voltage of a carrier or a direct current in order to transmit analog or digital
data. Amplitude modulation (AM) is the oldest method of transmitting human voice
electronically. In an analog telephone conversation, the voice waves on both sides are
modulating the voltage of the direct current loop connected to them by the telephone
company.
Modulate a Carrier
Amplitude modulation (AM) is also widely used to alter a carrier wave to transmit data.
For example, in AM radio, the voltage (amplitude) of a carrier with a fixed center
frequency (the station's channel) is varied (modulated) by the analog audio signal.
AM is also used for digital data. In quadrature amplitude modulation (QAM), both
amplitude and phase modulation are used to create different binary states for
transmission (see QAM). AM is also used to modulate light waves in optical fibers.
In AM modulation, the voltage (amplitude) of the carrier is varied by the incoming signal.
In this example, the modulating wave implies an analog signal.
Digital Amplitude
Vary the Amplitude
Shift Keying (ASK)
For digital signals, amplitude shift keying (ASK) uses two voltage levels for 0 and 1 as in
this example.
3. Types of amplitude modulation
In radio communication, a continuous wave radio-frequency signal (a sinusoidal carrier
wave) has its amplitude modulated by an audio waveform before being transmitted.
In the frequency domain, amplitude modulation produces a signal with power
concentrated at the carrier frequency and in two adjacent sidebands. Each sideband is
equal in bandwidth to that of the modulating signal and is a mirror image of the other.
Amplitude modulation that results in two sidebands and a carrier is often called double-
sideband amplitude modulation (DSB-AM). Amplitude modulation is inefficient in terms
of power usage. At least two-thirds of the power is concentrated in the carrier signal,
which carries no useful information (beyond the fact that a signal is present).
To increase transmitter efficiency, the carrier can be removed (suppressed) from the
AM signal. This produces a reduced-carrier transmission or double-sideband
suppressed-carrier (DSBSC) signal. A suppressed-carrier amplitude modulation
scheme is three times more power-efficient than traditional DSB-AM. If the carrier is
only partially suppressed, a double-sideband reduced-carrier (DSBRC) signal results.
DSBSC and DSBRC signals need their carrier to be regenerated (by a beat frequency
oscillator, for instance) to be demodulated using conventional techniques.
Improved bandwidth efficiency is achieved—at the expense of increased transmitter and
receiver complexity—by completely suppressing both the carrier and one of the
sidebands. This is single-sideband modulation, widely used in amateur radio due to its
efficient use of both power and bandwidth.
A simple form of AM often used for digital communications is on-off keying, a type of
amplitude-shift keying by which binary data is represented as the presence or absence
of a carrier wave. This is commonly used at radio frequencies to transmit Morse code,
referred to as continuous wave (CW) operation.
ITU designations
In 1982, the International Telecommunication Union (ITU) designated the various types
of amplitude modulation as follows:
Designation Description
A3E double-sideband full-carrier - the basic AM modulation scheme
R3E single-sideband reduced-carrier
H3E single-sideband full-carrier
J3E single-sideband suppressed-carrier
B8E independent-sideband emission
C3F vestigial-sideband
Lincompex linked compressor and expander
4. Power in Amplitude Modulation
o The envelope, or boundary, of the amplitude modulated signal embeds the
information bearing signal.
o The total power of the transmitted signal varies with the modulating signal,
whereas the carrier power remains constant.
o The total wave power which varies in amplitude, and not the carrier power. The
carrier power in an amplitude modulated system remains constant.
5. Modulation index
It can be defined as the measure of extent of amplitude variation about an unmodulated
maximum carrier. As with other modulation indices, in AM, this quantity, also called
modulation depth, indicates by how much the modulated variable varies around its
'original' level. For AM, it relates to the variations in the carrier amplitude and is defined
as:
where and were introduced above.
So if h = 0.5, the carrier amplitude varies by 50% above and below its unmodulated
level, and for h = 1.0 it varies by 100%. To avoid distortion in the A3E transmission
mode, modulation depth greater than 100% must be avoided. Practical transmitter
systems will usually incorporate some kind of limiter circuit, such as a VOGAD, to
ensure this. However, AM demodulators can be designed to detect the inversion (or 180
degree phase reversal) that occurs when modulation exceeds 100% and automatically
correct for this effect.[citation needed]
Variations of modulated signal with percentage modulation are shown below. In each
image, the maximum amplitude is higher than in the previous image. Note that the scale
changes from one image to the next.