Simple Squelch

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.

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