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The similarities and differences between modulator

source:http://www.dvb-tmodulator.com/news/48.html
Release time:2017-06-19
     The modulator process at the transmitter, the carrier signal phase amplitude modulation wave has a normal amplitude modulation AM with the modulation signal changes, modulator and demodulator must be composed of non-linear components, known as phase modulation or phase modulation, carrier signal amplitude Are the same, the device that completes the modulation process is called the modulator. In the modulator, the carrier signal frequency with the modulation signal changes, known as frequency modulation or FM, with FM said; with PM said. In both modulation processes, the frequency and phase changes are shown as changes in phase angle. Therefore, the FM and phase modulation are referred to as angle modulation or angle adjustment.

    Amplitude modulation is to use low-frequency signal to control the high-frequency carrier signal amplitude, so that the carrier amplitude with the modulation signal is proportional to change. The amplitude modulated high frequency carrier becomes the amplitude modulation wave, suppresses the carrier's double sideband amplitude modulation wave and suppresses the carrier's single sideband amplitude modulation wave. The modulation process is the process of moving the low frequency signal to the high frequency band. The modulator demodulator can also be implemented by circuitry such as a multiplier. The modulation process is to control the high frequency oscillator with the transmitted low frequency signal so that the parameters (amplitude, frequency and phase) of the output signal of the high frequency oscillator are changed with the change of the low frequency signal so as to move the low frequency signal to the high frequency band 9 Carried by high frequency signals. The demodulation process is the inverse of the modulation process, that is, the process of moving the low frequency signal from the high frequency carrier. Demodulation process in the receiver, to achieve the demodulation of the device called demodulator.

Related tags:modulator,demodulator,

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