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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].

Parameters

Channel Rate

Incoming sample rate of the FM baseband (integer)

Audio Decimation

Input to output decimation rate (integer)

Deviation

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

Gain applied to audio output (default = 1.0) (float)

Tau

Deemphasis time constant (default = 75e-6), specify tau=0.0 to prevent deemphasis (float)

Example Flowgraph

Implementing an FM broadcast band receiver is really easy.

Source Files

C++ files

TODO

Header files

TODO

Public header files

TODO

Block definition

TODO