28720491 Final Year Seminar on HDMI Technology

8/8/2019 28720491 Final Year Seminar on HDMI Technology

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Let Us Understand The Basic TermsMultimedia-combination of different content forms.

Interface-point of interaction between two systems or work groups.

High definition- refers to video having resolution substantially higher thantraditional television systems.



D efinition And Need Of H D MI

HD MI is a compact audio/video interface for transmitting uncompressed

digital data.

HD MI connects digital audio/video sources.

It s a single cable and user friendly that replaces the maze of cables.



Overview of H D MI

High quality sound or vision without compression of a video or audio signal.

HD MI pictures are smoother and sharp. Sound is also crisp and taut, without anydistortion.

HD MI works well with fixed-pixel displays such as LC D , plasma or D LP screens and

projectors.

A HD MI cable allows to match pixel-by pixel the native resolution of the screen suchas 16:9 or 4:3.

HD

MI signals are digital in nature. TVs and radios operate on analog signals.

HD MI has some built-in smarts.



Versions of H D MI

HDMI 1.0 - combines digital video signal with 2 channel audio signal.

HDMI 1.1 - transfer D olby D igital, D TS, and D VD -Audio surround signals,7.1channels of PCM audio.

HDMI 1.2 - to transfer SAC D signals in digital form from a player to a receiver.

HDMI 1.3 - increase the video bandwidth, transfer color depths up to 48-bits,

the 1080p resolution in use today.



HD MI VS D VI

HDMITechnology does not incorporatescontent security that is called HighD efinition Content Protection.

That D VI can only support digitalvideo on a single cable.

DVIHD MI technology incorporatescontent security that is called HighD efinition Content Protection.HD MI can support audio and videoon the same cable.



Pin Configurations



Pin D escriptions

TMDS Channel/

TMDS Clock

It was developed by Silicon Image.

Transfer huge amounts of data through a shielded cable.

each are capable of transfer rates up to 3.4Gbps a total 10.2Gbps.

Up to 48-bit resolution.

pixel clock for timing the data stream.



DDC channel & EDID chip

determine the audio / visual capabilities .

achieved by reading from an E D ID ROM chip.

automatically adjust the video and audio output.

HD CP utilizes the DD C channel to initiate a "handshake .



CEC-Consumer Electronics Control

One Touch Play.

System Standby.

One Touch Record.

D eck Control.

Tuner Control.



Content Protection - HDCP

by encrypting the digital content being sent from the source to the receivers.

the source and receivers initiate a "handshake" and validate that each device isan authorized one.

exchanges a special key called a Key Selection Vector or KSV.

XOR operation is applied to encrypt each decoded pixel with a 24-bit number.



Hot Plug Detect Signal

high voltage level when the E-E D ID is not available for reading.

asserted only when the +5V Power line from the Source is detected.

A Source may use a high voltage level to initiate the reading of E-E D ID data.

An HD MI Sink indicate any change of the E-E D ID by driving a low voltage levelfor at least 100 msec.



HD MI Block D iagram



Explanation

follow all of the rules for an H D MI Sink and H D MI Source.

four differential pairs that make up the TM D S data and clock channels.

DD C is used for configuration and status exchange between a single Source and asingle Sink.

CEC protocol provides high-level control functions .



HD MI Plugs/connectors

TY PE A -Nineteen pins, with bandwidth to support all S D TV, ED TV, and H D TVmodes.

TY PE B - This connector (21.2 mm × 4.45 mm) has 29 pins and can carry double thevideo bandwidth of Type A.

TY PE C - all positive signals of the differential pairs are swapped with theircorresponding shield.

TY P E D - shrinks the connector size to something resembling a micro-USB connector.



Encoder/ D ecoder



Explanation

TMD S Clock channel constantly runs at the pixel rate of the transmitted video.

each of the three TM D S data channels transmits a 10-bit character.

The input stream to the Source s encoding logic will contain video pixel, packet andcontrol data.

These data items are processed in a variety of ways .

are presented to the TM D S encoder as either 2 bits of control data, 4 bits of packetdata or 8 bits of video data per TM D S channel.

encodes one of these data types or encodes a Guard Band character on any givenclock cycle.



Advantages

Higher Quality.

Intelligence.

Authentication and Encryption.

D eep Colors.

No Compression.

D olby/ D TS.



D isadvantages

D istance Limitations

Switching D elays

Field Termination

Costly



Applications

Blu ray discs/H D D VD players

Personal computers

Wireless H D MI with low-latency, lossless H.264 video codec

Relationship with D isplay Port

Documents

28720491 Final Year Seminar on HDMI Technology