HDMI (High-Definition Multimedia Interface) is a digital connection standard that allows transmission of video and audio data between entertainment devices like Blu-ray players, video game consoles, and HDTVs. It supports standard, enhanced, and high-definition video formats with compressed digital audio. HDMI uses TMDS (Transition Minimized Differential Signaling) channels to transmit uncompressed video and compressed audio in packets. Different versions of HDMI have increased bandwidth capacity over time to support higher resolutions and more audio channels. While HDMI can transmit digital video similarly to DVI, it additionally supports audio and consumer electronics control features.

1. HDMI
HIGH DEFINITION MULTIMEDIA INTERFACE
Shashwat Shriparv
dwivedishashwat@gmail.com
InfinitySoft

2. INTRODUCTION
It is a connector between high definition
devices such as Blu-ray disc, a video game
console to a compatible digital audio or
video monitor such as digital television.

3. GENERAL
 HDMI encodes the video data into TMDS for
transmission digitally over HDMI.
 TMDS is a channel which carries video,
and/or audio through one of three modes;
1. Video Data Period:
The pixel of an active video are
transmitted.
2. Data Instant Period:
Audio are transmitted with a series of
packets.

4. 3. Control Period:
Occurs between video and data island
periods.
Different versions of HDMI have been
introduced, from HDMI 1.0 to 1.3. Same
cable is being used but there is difference in
throughput.

5. HDMI VS DVI
DVI used for carrying digital video on
modern computer monitors and graphic
cards. HDMI is backward compatible with
DVI and vice versa; but
 Audio and remote control features of
HDMI will not be available.
 Without support of HDCP on display,
the signal source, prevent end user
from viewing or recording certain
restricted contents.

8. SPECIFICATIONS
The are electrical and mechanical
requirements of the cable and connectors.
 Connectors:
HDMI specifications include three
connectors intended for different markets.
a. Standard type A HDMI connectors
has 19 pins with bandwidth to support
SDTV, EDTV & HDTV modes.
b. A high resolution type B HDMI 1.0
connector has 29 pin.

9. which allows to carry an expanded
video channel for use with very high
resolution displays.
c. A type C mini connector, intended for
portable devices but has the same 19
pins.
 Cable:
HDMI cables are available for type A to
type C. It is used to carry video, audio and
devices controlling signals.

10.  TMDS Channel:
Carries videos, audios through three
modes;
Video Data Period
Data Island Period
Control Period
 CEC Channel:
It is optional to implement, but
wiring is necessary, the channel
Uses a industry standard protocol.
Used for remote control functions.

11. Is a one-wire bidirectional serial bus.
Defined in HDMI 1.0, updated in HDMI
1.2a and again in 1.3a.

12. VERSIONS
 HDMI 1.0: December 2002
Single cable digital audio/video
connection, maximum of 4.9 Gbits/sec.
 HDMI 1.1: May 2004
Added support for DVD audio.
 HDMI 1.2: August 2005
Added support for one bit Audio, used
on super audio CDs, up to 8 channels.

13. The availability of HDMI type A
connector.
 HDMI 1.2a: December 2005
Fully specifies consumer electronics
control (CEC) features.
 HDMI 1.3: June 2006
Increased bandwidth to 10.2 Gbits/sec.
Availability of a new mini-connector for
devices (type C).

14.  HDMI 1.3a: November 2006
Cable modification for type C.
Source termination is recommended.
 HDMI 1.3b:
Testing specification (happening)
released on 26 march 2007.

15. CABLE LENGTH
 No specific cable length.
 HDMI 1.3 introduces 2 kinds of cables to
reduce the confusion about which cable
supports which video format.
 Category 1:
 Standard or HDTV
 28, AWG about 5 meter long
 Category 2:
 High speed/greater than HDTV
 Higher quality, 24 AWG about 12-15
meter.

16. HDMI & HD OPTICAL MEDIA PLAYER
 HD DVD, Blu-ray disc uses Dolby
Digital plus, Dolby True HD and DTS-
HD master Audio having very high
bitrates.
 HD DVD, Blu-ray permit “interactive
audio”.

17. CRITICISM
 Connector are not robust as previous
display connectors. Tripping over a cable
plugged into an HDMI port can easily
damage the port.
 Lack of security mechanism built on
connectors and plug are more prone to
physical and/ or electrical damage.

18. THANKYOU
Shashwat Shriparv
dwivedishashwat@gmail.com
InfinitySoft