Looks like you have your interpolator and your multiply blocks switched.
The way you have it, the L-R audio is interpolated up to a 200k sample rate, and then multiplied with a 19khz subcarrier at a 44.1k sample rate. Do the multiply first, then interpolate the product. Or alternately, simply change the 19 kHz sample rate to 200k. @(^.^)@ Ed On 3/28/11 3:23 PM, Marcin Szelest wrote:
Hello, I have created FM transmitter in GRC: http://szelest.org/question/TX_RX.grc.png Unfortunately demodulated audio has poor quality and annoying distortions. I have spent a lot of time on it without positive effect. Here is how demodulated audio sounds like: http://szelest.org/question/recorded.wav When I have created FM receiver in GRC (bottom part of the schematic), demodulated audio sounds perfectly on my PC. Any ideas? I'm using gnuradio3.3.0 + USRP2(with interpolation changed from 4 to 2) + BasicTX + FT857D as hardware receiver. GRC file: http://szelest.org/question/TX_RX.grc input WAV: http://szelest.org/question/indiana.wav Regards, Marcin SQ9DJJ _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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