A: It's the combination of modulator and demodulator. 调制解调器是由调制器和解调器组成。
The data decoding system entails several subsystems: demodulator, error detection and correction( EDC), demultiplexor, and digital-to-analog converters. 数据解码系统需要几个子系统:解调器、码探测和纠正、号分离器、数字模拟转换器。
demodulator
[ noun ] rectifier that extracts modulation from a radio carrier wave <noun.artifact>
demodulator \demodulator\ n. (Electronics) An electronic device which extracts the modulation from a radio carrier wave, and outputs the original information-bearing signal.