Squelch circuit

Details Squelch circuit Squelch circuit

H - Electricity

04

B

325/103

H04B 1/16 (2006.01)

Patent

CA 1226335

ABSTRACT A squelch circuit in which a phase locked loop (PLL) 5 having a voltage controlled oscillator (VCO) 7 and a phase comparator 10 is used to detect the number of zero crossings, these being low for a speech signal and high for noise. The error voltage produced in the phase locked loop 5 is fed through a network 12 which ensures that the matching of the input signal to the oscillator is faster when the input frequency drops than when the input frequency rises. The input signal is clipped to enhance the freq- uency spectra of speech by using a limiting amplifier. The muting gate 2 output is derived from the VCO 7 control volt- age of the PLL 5 to mute the output of the receiver when the VCO 7 output frequency is higher than a preset frequency for more than a preset time.

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