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FM Demod - GNU Radio
https://wiki.gnuradio.org/index.php/FM_Demod
Generalized FM demodulation block with deemphasis and audio filtering. This block demodulates a band-limited, complex down-converted FM channel into the the original baseband signal, optionally applying deemphasis. Low pass filtering is done on the resultant signal. It produces an output float stream in the range of [-1.0, +1.0]. Parameters
Demodulate FM with GNU Radio - Fun With Electronics
https://www.funwithelectronics.com/?id=11
Demodulate FM with GNU Radio ... The decimation is the number the sample_rate shall be divided with so that the signal gets a smaller sample rate afterwards, ... The output from the demod is actually the audio from the radio channel. This can be fed directly to an audio sink, but normally you would do some filtering first and deemphasizing to ...
gnuradio/fm_demod.py at master · gnuradio/gnuradio · …
https://github.com/gnuradio/gnuradio/blob/master/gr-analog/python/analog/fm_demod.py
class demod_200kf3e_cf (fm_demod_cf): """ WFM demodulation block, mono. This block demodulates a complex, downconverted, wideband FM: channel conforming to 200KF3E emission standards, outputting: floats in the range [-1.0, +1.0]. Args: sample_rate: incoming sample rate of the FM baseband (integer) audio_decim: input to output decimation rate ...
Python fm_demod_cf Examples, gnuradioblks2.fm_demod_cf ...
https://python.hotexamples.com/examples/gnuradio.blks2/-/fm_demod_cf/python-fm_demod_cf-function-examples.html
Python fm_demod_cf - 4 examples found. These are the top rated real world Python examples of gnuradioblks2.fm_demod_cf extracted from open source projects. ... #audio decimation 4000, #deviation 3000, #audio passband 4000, #audio stopband options.volume, #gain 75e-6) #deemphasis constant #the filtering removes FSK data woobling from the ...
gnuradio/wfm_rcv_fmdet.py at master - GitHub
https://github.com/gnuradio/gnuradio/blob/master/gr-analog/python/analog/wfm_rcv_fmdet.py
audio_decimation = int (audio_decimation) lowfreq =-125e3 / demod_rate: highfreq = 125e3 / demod_rate: audio_rate = demod_rate / audio_decimation # We assign to self so that outsiders can grab the demodulator # if they need to. E.g., to plot its output. # # input: complex; output: float: self. fm_demod = analog. fmdet_cf (demod_rate, lowfreq ...
python - Real-time FM demod results in clicking and ...
https://dsp.stackexchange.com/questions/76225/real-time-fm-demod-results-in-clicking-and-strangely-shaped-output
The getSamples() function is actually pretty large and contains some calls to UI objects to things like RSSI bars, but below is a slimmed-down version containing only the relevant demodulation code to get from baseband to NFM audio. The FM demod algorithm was borrowed from this post. (sig is the scipy.signal module and np is numpy)
Exploring GNU Radio
http://gnu.ist.utl.pt/software/gnuradio/doc/exploring-gnuradio.html
''' fm_demod_gain = 2200.0/32768.0 audio_rate = quad_rate / audio_decimation volume = 1.0 # input: complex; output: float fm_demod = gr.quadrature_demod_cf (volume*fm_demod_gain) # compute FIR filter taps for audio filter width_of_transition_band = audio_rate / 32 audio_coeffs = gr.firdes.low_pass (1.0, # gain quad_rate, # sampling rate audio ...
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