# Re: ATSC decoding **URL:** \ **Category:** GNU Radio\ **Created:** [June 24, 2010, 10:34am UTC](https://www.ruby-forum.com/t/re-atsc-decoding/190635 "2010-06-24T10:34:28Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Klaus\_Hueske](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/e8c25b/32.png) [@Klaus\_Hueske](https://www.ruby-forum.com/u/Klaus_Hueske)\ **Post date:** [June 24, 2010, 10:34am UTC](https://www.ruby-forum.com/t/re-atsc-decoding/190635/1 "2010-06-24T10:34:28Z")
Hi Stephen, Did you make progress with this zero byte output problem? Anyway, I’m wondering if the ATSC receiver implementation will work at all with the current version of Gnuradio. It looks like parts of the original ATSC implementation that was working with Gnuradio 0.9 have been adapted to be used in Gnuradio 2.0, but now we have 3.2.2. Anyone here who can verify that the provided code can decode ATSC signals? Thanks Klaus * * * On Mon, Apr 19, 2010 at 8:12 PM, Stephen B. [address@hidden](mailto:address@hidden) wrote: > We followed the instructions in ./gnuradio/gr-atsc/src/python/README to no > success. > > Using the FFT we found 507.25M to have a strong signal. > According to > [http://en.wikipedia.org/wiki/North\_American\_broadcast\_television\_frequencie](http://en.wikipedia.org/wiki/North_American_broadcast_television_frequencie) > s#UHF\_band > this is channel 20. > And according to > [http://www.fcc.gov/fcc-bin/tvq?state=AL&call=&arn=&city=&chan=14&cha2=69&se](http://www.fcc.gov/fcc-bin/tvq?state=AL&call=&arn=&city=&chan=14&cha2=69&se) > rv=&type=0&facid=&list=2&dist=&dlat2=&mlat2=&slat2=&dlon2=&mlon2=&slon2=&siz > e=9 > this is WCOV from Montgomery, Alabama. > So we do have the correct video carrier frequency, which I assume is the > frequency we want to record and decode into a video. > > Question #1) Is the video carrier the one that carriers the video, or would > it ---
**Author:** ![Klaus\_Hueske](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/e8c25b/32.png) [@Klaus\_Hueske](https://www.ruby-forum.com/u/Klaus_Hueske)\ **Post date:** [July 17, 2010, 9:49am UTC](https://www.ruby-forum.com/t/re-atsc-decoding/190635/2 "2010-07-17T09:49:40Z")
Hi all, I did some investigations regarding the zero output problem: First of all I installed gnuradio 0.9 on an old Red Hat 9 installation and made tests with the files from [http://comsec.com/data/README](http://comsec.com/data/README). As the 0.9 ATSC DTV decoder works fine, I took the intermediate save files (_.rxout, can be obtained when using the log function) and used them as input for the version 3.x ATSC decoder. It turned out that everything works fine if I use the 0.9 output after the bit timing loop (bt\__.rxout) as input for the 3.x frame sync block. Further, if I use the 0.9 fpll output as input for the 3.x bit timing loop nothing happens (zero output). So I guess the problem can be isolated to the bit timing loop. I still do not fully understand the code, so I hope someone can help me to further isolate the problem. If we can fix this we would finally have a working gnuradio ATSC receiver again! Regards Klaus -----Ursprüngliche Nachricht----- Von: [discuss-gnuradio-bounces+klaus.hueske=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+klaus.hueske=removed_email_address@domain.invalid) [[mailto:discuss-gnuradio-bounces+klaus.hueske=removed\_email\_address@domain.invalid](mailto:discuss-gnuradio-bounces+klaus.hueske=removed_email_address@domain.invalid)] Im Auftrag von Klaus Hueske Gesendet: Donnerstag, 24. Juni 2010 09:52 An: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) Betreff: Re: [Discuss-gnuradio] ATSC decoding Hi Stephen, Did you make progress with this zero byte output problem? Anyway, I’m wondering if the ATSC receiver implementation will work at all with the current version of Gnuradio. It looks like parts of the original ATSC implementation that was working with Gnuradio 0.9 have been adapted to be used in Gnuradio 2.0, but now we have 3.2.2. Anyone here who can verify that the provided code can decode ATSC signals? Thanks Klaus * * * On Mon, Apr 19, 2010 at 8:12 PM, Stephen B. [address@hidden](mailto:address@hidden) wrote: > Available hardware: USRP1, USRP2, WBX daughterboard, TVRX daughterboard > > We followed the instructions in ./gnuradio/gr-atsc/src/python/README to > no > success. > > Using the FFT we found 507.25M to have a strong signal. According to > [http://en.wikipedia.org/wiki/North\_American\_broadcast\_television\_freque](http://en.wikipedia.org/wiki/North_American_broadcast_television_freque) > ncie > s#UHF\_band > this is channel 20. > And according to > [http://www.fcc.gov/fcc-bin/tvq?state=AL&call=&arn=&city=&chan=14&cha2=6](http://www.fcc.gov/fcc-bin/tvq?state=AL&call=&arn=&city=&chan=14&cha2=6) > 9&se > rv=&type=0&facid=&list=2&dist=&dlat2=&mlat2=&slat2=&dlon2=&mlon2=&slon2= > &siz > e=9 > this is WCOV from Montgomery, Alabama. > So we do have the correct video carrier frequency, which I assume is > the > frequency we want to record and decode into a video. > > Question #1) Is the video carrier the one that carriers the video, or > would > it > /tmp/atsc\_pipe\_5 never fills with data. > Bobby Black > Auburn University > address@hidden > (334) 804-4826 * * * Discuss-gnuradio mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > **[Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)**