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无绳电话手机和座机之间通过无线传递的除话音、拨号及振铃信号外,还有手机控制座机摘挂机的控制信号,这个控制信号习惯上称为导频信号。 下面以Randix8320无绳电话为例,分析其密码开机的工作过程。 一.导频信号控制座机的工作原理 该手机电路中有一个正弦波振荡器作为导频信号发生器。手机工作时振荡器产生的正弦波作为导频信号,与通话信号一起对高频载频进行调制后发送给座机。座机对接收到的信号进行变频、中放、鉴频解调处理
In addition to voice, dialing and ringing signals wirelessly transmitted between the cordless handset and the landline, there is also a handset controlling the handset pick-up control signal, which is conventionally known as the pilot signal. The following to Randix8320 cordless phone, for example, analyze the password boot process. I. pilot signal control of the working principle of the landline The phone circuit has a sine wave oscillator as a pilot signal generator. When the mobile phone is working, the sine wave generated by the oscillator is used as a pilot signal, and the high frequency carrier frequency is modulated together with the call signal and sent to the base unit. Landline on the received signal frequency, in Fang, Kam demodulation