HD & SD on ATSC

Archived from groups: alt.video.digital-tv (More info?)

How many people have an HD station that broadcast the same show in HD and
SD. For example WBAL 11 Baltimore broadcasts HD (or HD upconverted from SD)
on 11-1 and SD on 11-2. I really don't see any reason for the SD subchannel
as all ATSC boxes do HD and have display options for 4:3 sets.

Also, it eats into the 19.4 where another station (WCAU for example) gives
it all to the 1080i.

I can see why the PBS stations would do this (1080i plus 480i) because
they're symalcasting the regular network with the HD network. But the extra
SD channel just seems like a waste (unless the DTV station comes in better
than the analog).

Archived from groups: alt.video.digital-tv (More info?)

Within these hallowed halls, Dennis Mayer of <Polaris1@execpc.com>
added the following to the collective conscience:
> 21C BBS wrote:
>>
>> How many people have an HD station that broadcast the same show in
>> HD and SD. For example WBAL 11 Baltimore broadcasts HD (or HD
>> upconverted from SD) on 11-1 and SD on 11-2. I really don't see any
>> reason for the SD subchannel as all ATSC boxes do HD and have
>> display options for 4:3 sets.
>>
>> Also, it eats into the 19.4 where another station (WCAU for example)
>> gives it all to the 1080i.
>>
>> I can see why the PBS stations would do this (1080i plus 480i)
>> because they're symalcasting the regular network with the HD
>> network. But the extra SD channel just seems like a waste (unless
>> the DTV station comes in better than the analog).
>
>
> Digital TV has the 19.38 'bandwidth' for transmitting
> any Digital 'Information' that fits within the limit....
>
> Be it 1 HD Program, 1 HD & 1 SD Program or 6 SD Programs....
>
> Time of Day, Local Info of interest (Weather, News, Sports),
> or Local Stations desire will fill that Bandwidth
> in the Future When Local Stations get ALL their
> Digital Control Room Equipment purchased &
> installed.. Then good multicasting will prosper...
>
> Be aware that 720p HD takes a little more Processing
> horsepower And less bandwidth than 1080i HD.
>
> Stations like FOX-HD, ESPN-HD, & ABC-HD have that
> 'extra' 720p bandwidth will have a need for less
> Digital/HD Signal compression...
>
> Only more time will lead to SD Programming developing...

My point was redundant programming.

Archived from groups: alt.video.digital-tv (More info?)

>How many people have an HD station that broadcast the same show in HD and
>SD

WKYC-TV 3 in Cleveland does. They broadcast three signals on their digital
channel.

1. the HDTV channel in 16:9 widescreen.

2. The SD channel, showing the same thing as the HDTV channel, except in 4:3

3. A 24 hour weather radar, in 4:3 format.