求翻译：调制和解调是通信系统中最为关键的功能模块。实际通信中，不少信道都不能直接传送基带信号，必须用基带信号对载波波形的某些参量进行控制，使载波的这些参量随着基带信号的变化而变化，即调制是什么意思？

Modulation and demodulation is a communication system, the most critical functional modules. Actual communication, many channels are transmitted baseband signal can not directly be used for baseband signal waveform of the carrier to control certain parameters, so that the carrier of these parameters

Modulation reconciliation is the most crucial functions of communication system module. In reality, many communications channel cannot be transmitted directly baseband signal, we must use a baseband signal to the carrier wave of certain parameters to control these parameters, the carrier of the base

The modulation and the demodulation are in the communications system the most essential function module.In the actual correspondence, many channels all cannot transmit the baseband signal directly, must use the baseband signal to carry on the control to carrier profile certain parameters, causes the

Is the most critical communication system of modulation and demodulation function module. Actual communications, many channels cannot transmit baseband signal, of load waveform must be a baseband signal to control some parameters, carrier these parameters vary as the baseband signal, that modulation

Modulation and demodulation is a communication system, the most critical functional modules. Actual communication, many channels are transmitted baseband signal can not directly be used for baseband signal waveform of the carrier to control certain parameters, so that the carrier of these parameters