HIGH DEFINITION MULTIMEDIA INTERFACE
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.
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
2. Data Instant Period:
Audio are transmitted with a series of
3. Control Period:
Occurs between video and data island
Different versions of HDMI have been
introduced, from HDMI 1.0 to 1.3. Same
cable is being used but there is difference in
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
The are electrical and mechanical
requirements of the cable and 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.
which allows to carry an expanded
video channel for use with very high
c. A type C mini connector, intended for
portable devices but has the same 19
HDMI cables are available for type A to
type C. It is used to carry video, audio and
devices controlling signals.
Carries videos, audios through three
Video Data Period
Data Island Period
It is optional to implement, but
wiring is necessary, the channel
Uses a industry standard protocol.
Used for remote control functions.
Is a one-wire bidirectional serial bus.
Defined in HDMI 1.0, updated in HDMI
1.2a and again in 1.3a.
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.
The availability of HDMI type A
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).
HDMI 1.3a: November 2006
Cable modification for type C.
Source termination is recommended.
Testing specification (happening)
released on 26 march 2007.
No specific cable length.
HDMI 1.3 introduces 2 kinds of cables to
reduce the confusion about which cable
supports which video format.
Standard or HDTV
28, AWG about 5 meter long
High speed/greater than HDTV
Higher quality, 24 AWG about 12-15
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
HD DVD, Blu-ray permit “interactive
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.