FM Demod

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Revision as of 00:39, 17 April 2021 by (talk) (→‎Parameters: updated Deviation to that of default in GRC
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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].


Channel Rate
Incoming sample rate of the FM baseband (integer)
Audio Decimation
Input to output decimation rate (integer)
Maximum FM deviation (default = 75000) (float)
Audio Pass
Audio low pass filter passband frequency (float)
Audio Stop
Audio low pass filter stop frequency (float)
Gain applied to audio output (default = 1.0) (float)
Deemphasis time constant (default = 75e-6), specify tau=0.0 to prevent deemphasis (float)

Example Flowgraph[edit]

Implementing an FM broadcast band receiver is really easy.

Pluto FM fg.png

Source Files[edit]

C++ files
Header files
Public header files
Block definition