(The PCM system is a bit more complex than the pulse imitation modulation method, and the baseband information needs to be managed many times. In the transmitter, these management processes are mainly sampling, quantization, and encoding. The quantization and encoding operations usually end up in one circuit. In a receiver of a PCM system, these managements are regeneration of the damaged signal, decoding and demodulation of the sequence of quantized samples. Of course, the regeneration of the signal is also performed on the transmission line based on needs, which is the regeneration repeater)
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