CompuServe Messages

>P.S. How difficult would it be to write the code to make the PAR 720×486 for CCIR 601. I >understand you are working on a dual drive setup as well, will this be downwardly compatible? >ie: a software upgrade The CCIR 601 standard was brought about by manufactures looking to build one product to sell in pal and ntsc. To do this you have to LOWER the sample rate from 14.318 Mhz to 13.25 Mhz. A lot of work went in to NTSC video and it was found that if you divid the band width by the samples rate you can get 768 samples per line ( 4 times subcarrier). Some of these are blanking leaving you with 752 ACTIVE samples (pixels) per line (D2). This has been time honored until some devices got so expensive that they could only afford to design one version (D1). In D1 they found that lowering the data rate 5% also made the device much cheaper at the same time, therefore more $ for Sony. For analog video 4:2:2 is better plain and simple. Does it fit in with the rest of the world, maybe not as well as you would like. We may be forced to go to it but we will be kicking and screaming all the way. The PC PAR has a crystal on the board which will always make that unit 4:2:2 (ie 752), so no CCIR 601 ever for that board. But since it is analog, it works with everything still. If this was a serial D1 ouput device ($$$$) you could make a case to make it compatable. We felt that what our customers really needed was a great encoder and spent the money to give them that. CCIR 601 does not make better looking video. We may be forced one day to go to this standard but it will be kicking and screaming. >I understand you are working on a dual drive setup as well, will this be downwardly >compatible? ie: a software upgrade The dual drive stuff is just a software update scheduled for June.