PCM modulation is a kind of source coding. The meaning of source coding is the conversion from analog signal to digital signal. After converted to digital signal, it is easy for us to process the signal such as encoding, filtering the unwanted signal and so on. Besides, the quality of digital signal is better than analog signal. This is because the digital signal can be easily recovered by using comparator. PCM modulation is commonly used in audio and telephone transmission. The main advantage is the PCM modulation only needs 8kHz sampling frequency to maintain the original quality of audio. above is block diagram of PCM.
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