What is HDMI?(2)

hdmi Digital interface defined around DVI 1.0 that transmits video and audio on the same physical channel.
hdmi Interface defined for use in the consumer market space.
hdmi Requires separate licensing from that of DDWG's DVI.
hdmi Allows DVI / HDMI products to be sold in consumer products.
hdmi Supports the use of HDCP copy protection.
hdmi Utilizes VESA's Display Data Channel to read E-EDID from a display.
hdmi Defines a different connector from that used on DVI.
hdmi Supports optional CEC (Consumer Electronics Control), which allows high level control of all A / V products in a user environment.

DVI 1.0: The Physical Interface
Digital Visual Interface (DVI) was developed by a group called the Digital Display Working Group or DDWG for the PC market.
The interface is a high speed digital serial interface based on Transition Minimized Differential Signaling or TMDS.
Source synchronous architecture. Uses a separate channel to transmit the clock.
Used to provide variable data rates to handle the various VESA supported display resolutions.
A complete connection from the source to the sink devices uses three data channels (RGB / YCbCr) and a clock. HDMI = DVI + Audio
Using the DVI physical link to transmit video / graphics
Audio is added as a logical layer to the DVI phy.
Digital audio processed into packets of data.
These packets are scheduled for transmission during existing horizontal and vertical blanking times within a frame.
In addition, HDMI implements a packet called an infoFrame.
InfoFramesare structures defined in the EIA-861B specification.
EIA-861B is spec for DTV and uncompressed high speed digital interfaces.

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