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Networks: Data Encoding

22

Pulse Code Modulation (PCM)

PCM uses non-linear encoding, i.e., amplitude spacing of levels is non-linear

There is a greater number of quantizing steps for low amplitude

This reduces overall signal distortion.

This introduces quantizing error (or noise).

PCM pulses are then encoded into a digital bit stream.

8000 samples/sec x 7 bits/sample = 56Kbps for a single voice channel.

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