Hdmi

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HIGH DEFINITION MULTIMEDIA INTERFACE

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Hdmi

  1. 1. HDMI HIGH DEFINITION MULTIMEDIA INTERFACE
  2. 2. INTRODUCTION <ul><li>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. </li></ul>
  3. 3. GENERAL <ul><li>HDMI encodes the video data into TMDS for transmission digitally over HDMI. </li></ul><ul><li>TMDS is a channel which carries video, and/or audio through one of three modes; </li></ul><ul><li>1. Video Data Period: </li></ul><ul><li>The pixel of an active video are transmitted. </li></ul><ul><li>2. Data Instant Period: </li></ul><ul><li>Audio are transmitted with a series of packets. </li></ul>
  4. 4. <ul><li>3. Control Period: </li></ul><ul><li>Occurs between video and data island periods. </li></ul><ul><li>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. </li></ul>
  5. 5. HDMI VS DVI <ul><li>DVI used for carrying digital video on modern computer monitors and graphic cards. HDMI is backward compatible with DVI and vice versa; but </li></ul><ul><ul><ul><li>Audio and remote control features of HDMI will not be available. </li></ul></ul></ul><ul><ul><ul><li>Without support of HDCP on display, the signal source, prevent end user from viewing or recording certain restricted contents. </li></ul></ul></ul>
  6. 8. SPECIFICATIONS <ul><li>The are electrical and mechanical requirements of the cable and connectors. </li></ul><ul><li>Connectors: </li></ul><ul><li>HDMI specifications include three connectors intended for different markets. </li></ul><ul><ul><ul><li>Standard type A HDMI connectors has 19 pins with bandwidth to support SDTV, EDTV & HDTV modes. </li></ul></ul></ul><ul><ul><ul><li>A high resolution type B HDMI 1.0 connector has 29 pin. </li></ul></ul></ul>
  7. 9. <ul><ul><ul><ul><li>which allows to carry an expanded video channel for use with very high resolution displays. </li></ul></ul></ul></ul><ul><ul><ul><li>A type C mini connector, intended for portable devices but has the same 19 pins. </li></ul></ul></ul><ul><li>Cable: </li></ul><ul><li>HDMI cables are available for type A to type C. It is used to carry video, audio and devices controlling signals. </li></ul>
  8. 10. <ul><li>TMDS Channel: </li></ul><ul><li>Carries videos, audios through three modes; </li></ul><ul><ul><li>Video Data Period </li></ul></ul><ul><ul><li>Data Island Period </li></ul></ul><ul><ul><li>Control Period </li></ul></ul><ul><li>CEC Channel: </li></ul><ul><li>It is optional to implement, but wiring is necessary, the channel </li></ul><ul><ul><li>Uses a industry standard protocol. </li></ul></ul><ul><ul><li>Used for remote control functions. </li></ul></ul>
  9. 11. <ul><ul><li>Is a one-wire bidirectional serial bus. </li></ul></ul><ul><ul><li>Defined in HDMI 1.0, updated in HDMI 1.2a and again in 1.3a. </li></ul></ul>
  10. 12. VERSIONS <ul><li>HDMI 1.0: December 2002 </li></ul><ul><li>Single cable digital audio/video connection, maximum of 4.9 Gbits/sec. </li></ul><ul><li>HDMI 1.1: May 2004 </li></ul><ul><li>Added support for DVD audio. </li></ul><ul><li>HDMI 1.2: August 2005 </li></ul><ul><li>Added support for one bit Audio, used on super audio CDs, up to 8 channels. </li></ul>
  11. 13. <ul><li>The availability of HDMI type A connector. </li></ul><ul><li>HDMI 1.2a: December 2005 </li></ul><ul><li>Fully specifies consumer electronics control (CEC) features. </li></ul><ul><li>HDMI 1.3: June 2006 </li></ul><ul><li>Increased bandwidth to 10.2 Gbits/sec. </li></ul><ul><li>Availability of a new mini-connector for devices (type C). </li></ul>
  12. 14. <ul><li>HDMI 1.3a: November 2006 </li></ul><ul><li>Cable modification for type C. </li></ul><ul><li>Source termination is recommended. </li></ul><ul><li>HDMI 1.3b: </li></ul><ul><li>Testing specification (happening) released on 26 march 2007. </li></ul>
  13. 15. CABLE LENGTH <ul><li>No specific cable length. </li></ul><ul><li>HDMI 1.3 introduces 2 kinds of cables to reduce the confusion about which cable supports which video format. </li></ul><ul><ul><li>Category 1: </li></ul></ul><ul><ul><ul><li>Standard or HDTV </li></ul></ul></ul><ul><ul><ul><li>28, AWG about 5 meter long </li></ul></ul></ul><ul><ul><li>Category 2: </li></ul></ul><ul><ul><ul><li>High speed/greater than HDTV </li></ul></ul></ul><ul><ul><ul><li>Higher quality, 24 AWG about 12-15 meter. </li></ul></ul></ul>
  14. 16. HDMI & HD OPTICAL MEDIA PLAYER <ul><li>HD DVD, Blu-ray disc uses Dolby Digital plus, Dolby True HD and DTS-HD master Audio having very high bitrates. </li></ul><ul><li>HD DVD, Blu-ray permit “interactive audio”. </li></ul>
  15. 17. CRITICISM <ul><li>Connector are not robust as previous display connectors. Tripping over a cable plugged into an HDMI port can easily damage the port. </li></ul><ul><li>Lack of security mechanism built on connectors and plug are more prone to physical and/ or electrical damage. </li></ul>
  16. 18. <ul><li>THANK YOU </li></ul>

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