The Design And Development Of HDMI On Audio/Video Receiver System

Along with the daily popularization of Digital Display Terminal,several Digital Transmission Interface standards have been launched.Among them,the High Definition Multimedia Interface,also known as HDMI is highly recognized due to its compact outlook,high transmission speed,and it capability of transmitting the A/V signals simultaneously on a single transmission line.Besides,HDMI can also work with High-bandwidth Digital Content Protection(HDCP)in order to avoid the unauthorized duplication of the audio/video that has copyrights.Due to the above specifications,the research and design of digital audio/video receiver system plays an important role in the application of HDMI.The Liquid Crystal Display as the display terminal for audio/video receiver system,and the HDMI application is researched and developed in this paper.Primary coverage includes next several aspects;Firstly,the research background,the main characteristics of HDMI,as well as the development of standard applications of HDMI are introduced.Secondly,the basic principles of the HDMI communications are explained. CAT6011 from Chip Advanced Technology Company is chosen as the HDMI receiver decoding chip in the design.The function block of CAT6011 and the video/audio processing flow as well as the auto-adapted equalizer which the chip integrated have been analyzed.The hardware designs for hot-plug function of HDMI,the choice of I2C wire's resistance,the ESD protection as well as the audio D/A transformation are proposed for references.The layout of the CAT6011 chip,the D/A transformation chip, the TMDS transmission line and the ESD protection have also been provided in this part.Thirdly,the basic flow-chart of CAT6011 is given.The two procedures for read -write variables on I~2C signal wire and the basic initialization program of CAT6011 are discussed.Besides,two main loops which consist of the interrupt control and the video signal processing are thoroughly analyzed.The HDCP decryption engine which is controlled by the software is illuminated.The plug and play technology following EDID standards are also introduced. Fourthly,Bases on the software and hardware design,two sets of the HDMI application project on the mature audio/video receiver system are proposed.These two sets of project respectively use LOCⅡand UOCⅢas the multi-purpose main chips. The advantages and disadvantages,the application scopes and the promoted situation between two sets of project are analyzed and compared.Multi-channel HDMI input plan can take CAT6341 as HDMI switch chip to provide the three inputs one out function.Finally,the HDMI receiver system compatible test standard is given in this paper. The prospective research and design of new HDMI1.3v protocol on the audio/video receiver system are discussed.The video/audio receiver systems with HDMI in this paper had been exhibit in IFA(The International Federation of Aromatherapists)in Berlin for Augest 2007. They have been massively manufactured,and mainly export to European contries at present.The successful application of HDMI on video/audio receiver systems have built some foundation on the HDMI1.3v protocol research and design in future.