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Networks: Data Encoding

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Analog Data, Digital Signals [Example – PCM (Pulse Code Modulation)]

The most common technique for using digital signals to encode analog data is PCM.

Example: To transfer analog voice signals off a local loop to digital end office within the phone system, one uses a codec.

Because voice data limited to frequencies below 4kHZ, a codec makes 8000 samples/sec. (i.e., 125 microsec/sample).

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