[opendtv] Re: Low-Power KAXT Goes Digital With 20 Sub-Channels Available
- From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 6 Sep 2009 17:28:11 -0400
Kon Wilms wrote:
> Richard Hollandsworth wrote:
>> KAXT may be carrying a TOTAL of 20 Sub-Channels,
>> but only 12 of them are Video, the others are
>> low rate AC-3 at either 48 kbps or 56 kbps. There
>> are 3 Video channels at about 2 Mbps and the
>> remaining average around 1.3 Mbps....which is
>> probably just fine for shopping channel static
>> displays:
http://www.w6rz.net/kaxt.htm
>
> And 640x480i @ 15fps for the video channels.
No need to guess. Unless they are lying, all of the video is 480i at 29.97 fps,
and they also claim 15 Mb/s, which I interpret to be a possible peak bandwidth,
since they are using stat mux.
For video programming, the lowest average among the video streams is 0.94 Mb/s,
and the highest average is 2.14 Mb/s. Many of the video streams come in around
1.3 Mb/s avg.
That's 12 video channels. An impressive number, if they are watchable.
The audio-only channels are from 70 to 80 Kb/s, which is very close to the 100
Kb/s audio quality used in almost all of their 12 TV channels, and is also
higher than the bit rates used in most of the HD radio audio streams.
Possibly, the 70-80 Kb/s are shared among more than just one audio stream. As a
comparison, I've heard HD Radio in the AM band, which should be limited to ~20
Kb/s, and it's not half bad for voice. Compared with AM radio, there is no
comparison.
It would be nice to know what the TV subchannels actually look like.
Bert
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