Simple Squelch: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
Simple squelch block based on average signal power and threshold in dB.
Simple squelch block based on average signal power and threshold in dB. The output equals the input if the average input is >= the threshold, and zero otherwise.


This is a basic template. Please improve it.
The average is computed using a Single Pole IIR filter. It uses the magnitude squared for both averaging and for comparing to the threshold.


== Parameters ==
== Parameters ==
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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.
This flowgraph shows a Simple Squelch block in a working 2 meter receiver.
 
[[File:FunCube_2_meter_NB_FM_fg.png|800px]]


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


; C++ files
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-analog/lib/simple_squelch_cc_impl.cc simple_squelch_cc_impl.cc]


; Header files
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-analog/lib/simple_squelch_cc_impl.h simple_squelch_cc_impl.h]


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

Latest revision as of 13:16, 19 January 2022

Simple squelch block based on average signal power and threshold in dB. The output equals the input if the average input is >= the threshold, and zero otherwise.

The average is computed using a Single Pole IIR filter. It uses the magnitude squared for both averaging and for comparing to the threshold.

Parameters

(R): Run-time adjustable

Threshold (R)
Threshold for muting.
Alpha
Gain parameter for the running average filter.

Example Flowgraph

This flowgraph shows a Simple Squelch block in a working 2 meter receiver.

FunCube 2 meter NB FM fg.png

Source Files

C++ files
simple_squelch_cc_impl.cc
Header files
simple_squelch_cc_impl.h
Public header files
TODO
Block definition
analog_simple_squelch_cc.block.yml
Retrieved from "https://wiki.gnuradio.org/index.php?title=Simple_Squelch&oldid=10325"