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本文论述在一对普通电话线上传送多表值和传码的原理。在远程遥控设备中,经常会遇到两地(即主控端和受控端)切换开关的频率一致、相位一致和位置一致(即位同步)等要求。这是保证远距离传输信号的基本和必要条件。这三个项目中任何一项如有误差,都不能把信号正常地传输到对方。能够达到这三个项目一致的电路比较多,有各种各样的形式。本文主要是分析一种经过试验行之有效的具有位同步自校功能的同频同相电子开关,并详细讨论怎样实现位同步自校和自校过程。这种电路具有线路简单,稳定可靠等优点,可以在电视发射台、差转台中使用。
This article discusses the principle of transmitting multi-table values and pass codes over a common pair of telephone lines. In the remote control device, often encounter two places (ie, master and controlled side) switch the frequency of consistent, consistent and consistent position (ie, bit synchronization) and other requirements. This is the basic and necessary condition for ensuring long-distance transmission of signals. If any one of the three items is in error, it will not be able to transmit the signal normally to each other. Able to achieve the same three circuits these projects are more, there are a variety of forms. This paper mainly analyzes a well-tested, same-frequency, in-phase electronic switch with bit-synchronous self-calibration function, and discusses in detail how to realize bit-synchronization self-calibration and self-calibration process. This circuit has the advantages of simple circuit, stable and reliable, can be used in the TV transmitter, poor turntable.