Difference between revisions of "FM Demod"

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(correct parameter descriptions)
 
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; Audio Decimation
 
; Audio Decimation
: Maximum FM deviation (default = 5000) (float)
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: Input to output decimation rate (integer)
  
 
; Deviation
 
; Deviation
: Input to output decimation rate (integer)
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: Maximum FM deviation (default = 5000) (float)
  
 
; Audio Pass
 
; Audio Pass
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== Example Flowgraph ==
 
== 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.
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Implementing an FM broadcast band receiver is really easy.
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[[File:Pluto_FM_fg.png|800px]]
  
 
== Source Files ==
 
== Source Files ==

Latest revision as of 16:51, 20 August 2020

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[edit]

Channel Rate
Incoming sample rate of the FM baseband (integer)
Audio Decimation
Input to output decimation rate (integer)
Deviation
Maximum FM deviation (default = 5000) (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[edit]

Implementing an FM broadcast band receiver is really easy.

Pluto FM fg.png

Source Files[edit]

C++ files
TODO
Header files
TODO
Public header files
TODO
Block definition
TODO