Networks: Data Encoding
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).