1、概要在分配的信道上,通常把制止来自其它用户的不要的串音的方法叫做音锁(tone lock)或单音静噪(tone Squelch)。技术上,术语“音锁”是讲整个单音系统,而当指接收机的“解锁”功能时,则用“单音静噪”。接收期间,在未收到所要的信号时,这种方法起着作用。通常把这种系统叫做“双静噪”,因为它使用单音与载波/信噪两者串联工作的静噪电路。其原理是以叠加在所要的传输载波上的低电平亚音频单音同时辐射为基础。收到此单音, 1. Overview On assigned channels, the usual method of stopping unwanted crosstalk from other users is called tone lock or tone squelch. Technically, the term “sound lock” refers to the entire tone system, and when referring to the receiver’s “unlock” function, “tone mute” is used. During reception, this method plays a role when the desired signal is not received. This type of system is often called “dual squelch,” because it uses a squelch circuit that works in series with both tone and carrier / signal noise. The principle is based on the simultaneous sub-tone subwoofer superimposed on the desired transmission carrier. When you receive this tone