On Tue, May 10, 2005 at 07:50:43AM -0400, Anthony Vito wrote: > > Shows can be more than > > 19.6Mb/s when they have multiple audio subchannels. > > I call bullshit!! 8VSB at 6Mhz is limited to 19.39Mbps for the _full_ > transport layer. That includes all video and audio channels. If you > want more audio channels, you have to give up some video bandwidth. > > http://www.broadcast.net/~sbe1/8vsb/8vsb.htm
Oh the language.. I am wrong from time to time, but not this time. :) It is true you can't go over your RF bandwidth... But who said the RF bandwidth was 19.39Mb/s?.. because it surely is not. ATSC is a 45Mb/s RF data stream. If a channel were sending a 1080i stream (19.39Mb/s), then how could they ever send other video sub channels? (And don't say they cut their video bandwidth of the 1080i stream.. ;) However a station wants to fill their 45Mb/s stream is up to them. 2 1080i and 1 480p stream, 3 720p streams, 1 1080i and 1 480p, or 1 480i stream... it doesn't matter, and many stations have unused bandwidth. Yes broadcast uses 8VSB at 6mhz, but it's on 45Mb/s, not 19.39Mb/s. One area I do need to still research is if the 19.39 includes or does not include the redundant packets for error correction. --Brandon
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