"COMPRESSION OF PROPOSED US SPECTRUM-COMPATIVLE HDTV FORMATSFOR DIGITAL TRANSMISSION AT 44 MILLION BITES FOR SECOND"

THE OBJECTIVE OF THIS RESEARCH IS TO APPLY ADVANCED VIDEO COMPRESSION TECHNIQUES TO THE PROBLEM OF COMPRESSING HIGH DEFINITION TELEVISION (HDTV) SIGNALS FOR TRANSMISSION OVER 44MB/S DIGITAL FACILITIES. THE RESEARCH WILL ASSESS THE APPLICABILITY OF IMAGE COMPRESSION TECHNIQUES, ESPECIALLY THE DISCRETE COSINE TRANSFORM, TO COMPRESSION OF THE 3MHZ "AUGMENTATION CHANNEL"USED IN THE SPECTRUM-COMPATIBLE TWO-CHANNEL SCHEMES PROPOSEDTO THE FCC FOR RF TRANSMISSION OF HDTV. THE PRIMARY TOOL WILL BE COMPUTER SIMULATION OF HDTV MOTION IMAGES IN NON-REAL TIME USING VAX MINICOMPUTERS. SIMULATION WILL BE PERFORMED TO GAIN INSIGHT INTO WHICH PROPOSED SYSTEMS LEND THEMSELVES BEST TO DIGITAL COMPRESSION, AND TO LEARN WHAT BITRATES ARE REQUIRED TO ACHIEVE GOOD PERFORMANCE AS MEASURED BY MSE AND SUBJECT ANALYSIS OF ARTIFACTS. ALGORITHMIC CHANGES AND INVENTIONS WILL BE MADE IN RESPONSE TO THE INITIAL FINDINGS, WITH ADDITIONAL SIMULATIONS TO FURTHER DEVELOP THE KNOWLEDGE BASE. A FINAL STEP IS TO USE THE RESULTS, PLUS EXISTING KNOWLEDGE OF COMPRESSION FOR THE NTSC-COMPATIBLE CHANNEL, TO ESTIMATE THE AVAILABLE FACILITY BITRATE OF 44MB/S.