Hi, Can you try a few things -->
1. Do not interpolate the signal right now for video ... low pass filter it with a cutoff of some 3 Mhz and then do an AM demodulation, extract the timing information and display the monochrome video. It will not be very sharp but will be good enough 2. Instead of downconverting the audio carrier to the baseband, try putting a bandpass filter around the audio carrier with a pass band of arnd 200 kHz .. now if you take the instantaneous phase of this signal, you will get the phase at baseband + carrier freq. component .. this carrier freq componenet can be subtracted .... this way not much computation should be required (by not downconverting) .. this filtering can be IIR as envelope distortion does not matter here probably ... Regards Prateek On 6/23/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > Hi, > > In the process of demodulating the video sigal from the tv signal we receive, > we > have been interpolating from 8 MS/s by a factor of 2 to 16 MS/s. However, > just > demodulating the audio alone takes 97% of our computer's usage, and as soon as > we interpolate to 16 MS/s the usage peaks at 100% and we get usrp overload > errors. Currently our computer's processor is 3.6 GHz. I was wondering if > anyone else has come accross computer processing problems when demodulating > the > video. > > thanks > Brent > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- Prateek Dayal B.Tech 4th Year ECE IIT Guwahati www.geocities.com/pmd_iitgw _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
