Has anyone benchmarked the ATSC encode function? Can this be done in real time? Decode is always harder to do than encode :)
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Charles Swiger Sent: Friday, October 27, 2006 10:56 AM To: Kyle Zhou Cc: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] ATSC real-time application? On Sat, 2006-10-28 at 01:19 +1000, Kyle Zhou wrote: > I am quite interested in the ATSC project due to some previous HDTV > R&D experience. > I am not quite sure about the current status of this project. > According to my understanding, ATSC has a very high throughput > requirement with a symbol rate=10.72M / sec > Considering this high symbol rate and the computationally intense > algorithm in RS decoder, Equalizer, Viterbi, etc., I am just wondering > how powerful the computer has to be to process all these in realtime? > What kind of computers have been used in the gr-atsc project to > process realtime HDTV? None that I know of. With a 4-cpu 2Ghz system with the processes spread out so the total utilization is 80%, there's still a maybe (rough guess) 7:1 process-time to real-time ratio. At least I seem to remember taking at least 14 hours to process a 2 hour movie. The bottleneck (cpu running 99%) was still the gnuradio0.9 part from bit-timing-loop to field-sync-demux. Once atsc is completely ported to the 2.x framework more can be done to optimize things. >Recalling that a PC do not have the luxury of parallel computation. For >instance, a 4.0G CPU has to process one symbol in 400 clock durations, >which seems to be not enough. That's the question - is the most intensive atsc function too much for a commonly available cpu to process in realtime? _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
