Jasjit Singh Jolly

EEE-7th sem

0311324908

Existing cable schemes

Component cables: Analog interface. Three cables for video + 2 for audio.

Composite cables: Analog interface. One cable for video + 2 for audio.

DVI: Digital Visual interface. Uses single cable for video transmission but lacks audio channel.

HDMIHDMI stands for High Definition

Multimedia Interface. It is an uncompressed, all-digital

signal audio/video interface with 10 Gbps of available bandwidth. It contains 19 wires wrapped in a single cable. Uses HDCP technology for protection.

This new connection standard was developed by Hitachi, Matsushita, Phillips, Silicon Image, Sony, Thomson (RCA) and Toshiba

What is HDMI ?• HDMI provides an interface between any A/V source, such as a set-

top box, DVD player, blu ray player, ps3, xbox etc or A/V receiver and an audio and/or video monitor, such as a digital television (DTV), over a single cable.

• HDMI supports standard, enhanced, or high-definition video, plus multi-channel digital audio on a single cable.

• Transmits all ATSC HDTV standards and supports 8-channel, 192kHz, uncompressed digital audio, all currently-available compressed formats & lossless digital audio formats with bandwidth to spare to accommodate future enhancements and requirements.

Supported signals:

Audio: LPCM, Dolby Digital, DTS, DVD-Audio, Super Audio CD, Dolby Digital Plus, Dolby TrueHD, DTS-HD High Resolution Audio, DTS-HD Master Audio, MPCM, DSD, DST.

Video: 480i, 480p, 576i, 576p, 720p, 1080i, 1080p,1440p, 1600p, 2160p, etc.

Typical Component Set-Up

Typical HDMI Set-Up

Pin diagram

Pins 1 through 9 carry the three TMDS (transition minimized differential signaling) data channels, three pins per channel. Each channel has three separate lines for + values, - values, and a ground or data shield.

Pins 10 through 12 carry data for the TMDS clock channel, which helps keep the signals in synchronization. As with the TMDS data channels, there are separate lines for + values, - values, and a data shield.

Pin 13 is carries the CEC (consumer electronic control) channel.

Pin 14 is reserved for future use.

Pins 15 and 16 are dedicated to the DDC (Display Data Channel), used for communicating EDID (Extended Display Information data) information between devices.

Pin 17 is a data shield for the CEC and DDC channels.

Pin 18 carries a low-voltage (+5V) power supply.

Pin 19 is the Hot Plug Detect, dedicated to monitoring power up/down and plug/unplug events.

Transition minimized differential signaling (TMDS) is a way of encoding digital information so that it doesn't degrade as much as it travels down a cable.

Digital signals are in binary form, meaning 1s and 0s. Electrically, a 1 is electricity flowing and a 0 is no electricity flowing. Digital binary signals generally travel better than analog signals, but they can degrade. It happens when the sharp drop in voltage from 1 to 0 becomes more of a slope.

TMDS protects against this in two ways:- It reduces the number of times the signal switches between 1 and 0.

- It carries the signal twice; once as the signal and the second time as the inverse of the signal. Since the receiver measures the difference between the signal and its inverse, it has a bigger gap to measure.

TMDS

HDMI Signal Configuration

HDMI VersionsFeatures:Version 1.0: Uncompressed audio and video over

a single cable.Version 1.1: DVD audio output.Version 1.2: Super Audio CD output.Version 1.3: Bandwidth doubled to 10.2 Gbps.Version 1.4: Addition of a 100 Mb/s HDMI Ethernet

channel. Support for 3D over HDMI.

A Micro HDMI Connector.

HDMI Ethernet

Current scenario for internet connection

Using HDMI Ethernet. It incorporates a dedicated data channel into the HDMI link, enabling high-speed, bi-directional networking at up to 100 Mb/sec.

What is HDCP?High-bandwidth Digital Content Protection encrypts

data over HDMI.

HDCP helps bring high-definition digital content to consumers by providing copy protection over HDMI

How it works

DisadvantagesDistance Limitations: HDMI cable is not suggested for long cable runs,

due to twisted pairs of copper conductors that are small gauge.

Switching Delays: Sometimes, blank screens can be caused due to authentication delays. There can also be screen flashing errors.

Costly: HDMI cables are more expensive (per meter) than their analog counterparts.

HDCP Criticism: Many HDTV do not have HDCP. In future if keys are revoked signals will be

degraded.

Typical HDMI uses

Thank You