connected tone-controlled squelch system
continuous tone controlled squelch system
dynamic squelch circuit
noise squelch oscillator
squelch blocking threshold
squelch circuit
啸声抑制电路
静噪电路
消杂音电路
无噪声党电路
消噪声电路
噪声抑制电路
squelch detuning threshold
Squelch Opening and Closing Level
squelch opening delay and closing delay
squelch opening level and closing level