HD & SD

[John Polulach]

I read a while back that, given bandwidth limitations, networks could broadcast (at one time) either one HD program or simulcast several SD programs.  So, when I was watching CSI on HD CBS 1-1 tonight, why/how were 1-2 and 1-3 being transmitted at the same time.  Just curious.

John

[Gregg Lengling]

You can transmit the HD program along with 1 or so other programs.  However you will notice the difference in the quality of the received pictures if only the HD program is running without an additional SD program.  4 SD programs can run at once, in addition to other data streams or in the case of channel 10...a poor quality 5th video feed of live eagles nesting.


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Gregg R. Lengling
RCA P61310 61" 16x9
gregg@camelcomm.com

[Tom Snyder]

That was a question posed to Jim Hall, CBS58's GM in live chats here when they launched their digital signals.
 http://www.milwaukeehdtv.org/hallchat1.html  

Apparently with the right compression, and an actively monitored dynamic bandwidth allocation to the various channels, they can broadcast HD on 1-1 and still have the bandwidth left over to show stuff on other channels.