用于无线电传输时，信号用载波传送，通过改变(调制)载波的振幅、频率或间隔来实现。
FOR radio transmission, inFORmation is imparted to a carrier wave by varying (modulating) its amplitude, frequency, or duration.
介绍一种利用220伏同相电力线载波传送dtmf编码数据的系统中的通讯及控制电路的设计，它与数据采集电路及数据处理电路构成一个完整的系统。
The design of the communication and controlling circuit that transmits DTMF code in AC220 inphase power line is presented. It forms a complete system with data picking and processing circuit.
介绍提高载波机传送远动信号质量的几项有效措施。
The paper introduces some efficient ways for improvement the quality of remote signal transmitted by carrier wave.
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