<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="Ih2E3d"><br>
> I look forward to the day when more broadcasters actually use higher<br>
> bitrates... Here, only CW and NBC use such a high bitrate.<br>
><br>
> Mike<br>
<br>
</div>Doesn't CBS broadcast in 1080i too? I thought only Fox and ABC used 720p?<br>
<font color="#888888"></font></blockquote><div><br>Bitrate, not resolution. For example, here at WCJB-TV in sunny Gainesville, Florida, we use our 19.2 Mbits to broadcast 2 program streams. One is ABC, which is broadcast at 720p , and one is the CW, which is broadcast in a 480i format. <br>
<br>Before these signals leave the building, they are joined together in a muxer - a fancy computer that takes one HD-SDI video signal, one SDI video signal, and puts out a single SMPTE 310 signal, which is a fancy name for baseband ATSC, I believe. <br>
<br>Anyhow, the muxer tries to squeeze as much video quality into the 19.2 Mbits as it can, and it dynamically reapportions bandwidth between the 2 program streams. When all is said and done, the CW usually ends up with about 5 Mbits and ABC gets about 12.5 Mbits. I honestly do not know what happens to the other 1,700,000 bits per second. <br>
<br>The end result is that the CW looks quite good, an ABC does not. Our neighbors at WUFT, the University of Florida PBS station, do things a little differently. They have 3 program streams, one which is usually 1080i and two standard def. The give their HD channel about 14 Mbit and squeeze their SD channels into about 2 Mbit apiece. <br>
<br>The half-wits at WOGX (FOX out of Ocala) use their 19.2 Mbits to broadcast an HD and an SD version of the *same thing*. I'm sure the many people stuck with an SDTV and a digital tuner that doesn't downscale appreciate this. <br>
<br>-chris <br></div></div> <br><br clear="all"><br>-- <br>TV/IT Engineer<br>WCJB-TV Gainesville, FL<br>(352) 416 0648<br><a href="mailto:cribe@wcjb.com">cribe@wcjb.com</a>