WBFM Receive PLL: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
Hierarchical block for demodulating a broadcast FM signal.
This is the template for the [[:Category:Block_Docs|"Page-per-block Docs"]].  This first section should describe what the block does and how to use it, using however many paragraphs necessary.  Note that the title of the wiki page should match the block's name in GRC, i.e. the one defined in the block's .grc file.  Look at the [[FFT]] Block for a good example.


As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
The input is the downconverted complex baseband signal (gr_complex).
 
The output is the demodulated audio (float)
 
Compared to [[WBFM Receive]], this one does a full stereo demodulation.


== Parameters ==
== Parameters ==
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>


; Quadrature Rate
; Quadrature Rate
: Description of parameter, provide any tips or recommended values. Note that the name of the parameter above should match the param's label that shows up in grc (e.g. Sample Rate).
: Input sample rate of complex baseband input. (float)


; Audio Decimation
; Audio Decimation
: blah blah blah
: How much to decimate quad_rate to get to audio. (integer)
 
; Deemphasis Tau
: Deemphasis time constant (float) - typically 75e-6 (US) or 50e-6 (Europe)


== 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.
This flowgraph shows the stereo version of the WBFM receiver. The flowgraph file can be found in https://github.com/gnuradio/gnuradio/blob/master/gr-analog/examples/USRP_FM_stereo.grc
 
[[File:USRP_FM_stereo_pll.png|803px]]


== Source Files ==
== Source Files ==


; C++ files
; Python files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-analog/python/analog/wfm_rcv_pll.py]
 
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
 
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]


; Block definition
; Block definition
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-analog/grc/analog_wfm_rcv_pll.block.yml]

Latest revision as of 18:09, 22 August 2023

Hierarchical block for demodulating a broadcast FM signal.

The input is the downconverted complex baseband signal (gr_complex).

The output is the demodulated audio (float)

Compared to WBFM Receive, this one does a full stereo demodulation.

Parameters

Quadrature Rate
Input sample rate of complex baseband input. (float)
Audio Decimation
How much to decimate quad_rate to get to audio. (integer)
Deemphasis Tau
Deemphasis time constant (float) - typically 75e-6 (US) or 50e-6 (Europe)

Example Flowgraph

This flowgraph shows the stereo version of the WBFM receiver. The flowgraph file can be found in https://github.com/gnuradio/gnuradio/blob/master/gr-analog/examples/USRP_FM_stereo.grc

USRP FM stereo pll.png

Source Files

Python files
[1]
Block definition
[2]
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