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

Channel Rate

Incoming sample rate of the FM baseband (integer)

Audio Decimation

Maximum FM deviation (default = 5000) (float)

Deviation

Input to output decimation rate (integer)

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

Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI. Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately. The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.

Source Files

C++ files

TODO

Header files

TODO

Public header files

TODO

Block definition

TODO