Re: ATSC decoding - Zero Output Problem - Update

GNU Radio
1

I’m new to GNURadio and trying to get ATSC receiving going again. This
message is in response to the message at:
http://lists.gnu.org/archive/html/discuss-gnuradio/2010-07/msg00285.html

http://lists.gnu.org/archive/html/discuss-gnuradio/2010-07/msg00285.html
I believe the reason your 0.9 output is working beyond the bit timing
loop
is because of a sampling rate difference between 0.9 and 3.X. 0.9
samples at
either 20MS/s or 21.52MS/s, while 3.X uses 19.2MS/s. The test files
located
at http://comsec.com/data/README are sampled at 20MS/s. The reason it
works
beyond the bit timing loop, with the output from 0.9, is because only
the interpolator, fpll, and bit timing loop (at least those are the ones
that I found an explicit reference to a sampling rate) care about the
sampling rate.

Thus you have proven that the field_sync_demux and beyond are working,
but
anything before that is potentially at fault. I’m trying to narrow down
the
issue, but haven’t found anything yet.

Bryce K.

2

Has anyone been able to get the ATSC receiver working end-to-end since
it
was ported from 0.9? I’m able to get field sync aways into a small
capture
file, but the resulting transport stream file is not playable in Totem
(with
Xine backend). Does anyone have suggestions for where to look? I’m new
to
Gnuradio, so I’m still getting a feel for the codebase. Also, is there a
better media player I should be using for the TS files?

Thanks,
Bryce K.

3

On Fri, Oct 22, 2010 at 11:33 AM, Bryce K. [email protected] wrote:

Has anyone been able to get the ATSC receiver working end-to-end since it
was ported from 0.9? I’m able to get field sync aways into a small capture
file, but the resulting transport stream file is not playable in Totem (with
Xine backend). Does anyone have suggestions for where to look? I’m new to
Gnuradio, so I’m still getting a feel for the codebase. Also, is there a
better media player I should be using for the TS files?
Thanks,
Bryce K.

I’ve recently gotten about as far as you in working with it. I get the
field syncs fine, but the following decoding hasn’t worked for me for
a long time. I have an interest in getting it back up and running
again, so please pass on anything more you can find out about it.

Tom