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gnuradio - Decimation to listen to FM radio with gnu radio ...
https://ham.stackexchange.com/questions/6506/decimation-to-listen-to-fm-radio-with-gnu-radio
We can't decimate by fractional samples, so we must write that as a ratio of integers: 20000000 480000 = 500 12. GNU Radio's low-pass filter block can perform decimation but not interpolation, so we can refactor that fraction as: …
gnuradio `wfm_rcv_pll` constructor has `audio_decimation ...
https://gitanswer.com/gnuradio-wfm-rcv-pll-constructor-has-audio-decimation-parameter-but-doesn-t-use-it-c-738224490
The audio decimation is calculated to match these (and truncated to an integer). There are no other decimation stages. The filter you mentioned is a bandpass filter centered at 38 kHz (the stereo sub-carrier modulated with DSB-SC) which is obtained doubling the output of the PLL for the pilot tone (19 kHz).
c++ - Digital signal decimation using gnuradio lib - Stack ...
https://stackoverflow.com/questions/25960223/digital-signal-decimation-using-gnuradio-lib
I found a project gnuradio where are functions for this problem. But I can't figure how to use them correctly. I need signal decimate (for example from 250Hz to 200Hz). The function should be similar to resample function in Matlab. I found, the classes for it are: rational_resampler_base_fff Class source. fir_filter_fff Class source.
Audio File Transmission using GNU RADIO and USRP
https://academic.csuohio.edu/yuc/mobile/mcproj/8d-Audio%20File%20Transmission%20using%20GNU%20RADIO%20and%20USRP%20.pdf
transmitter, we sampled the audio at 48 kHz, the rate at which it was stored, then converted it to 192 kHz using WBFM. After that it sent to the Rational Resampler for some interpolation and decimation. Then we multiply the cosine signal to reduce the effect of noise at high frequencies, and passed it to the USRP.
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