EE-597 Class Notes - DPCM
Phil Schniter · 2004
1.1 Pulse Code Modulation • PCM is the “standard” sampling method taught in introductory DSP courses. The input signal is 1. filtered to prevent aliasing, 2. discretized in time by a sampler, and 3. quantized in amplitude by a quantizer before transmission (or storage). Finally, the received samples are interpolated in time and amplitude to reconstruct an approximation of the input signal. Note that transmission may employ the use of additional encoding and decoding, as with entropy codes. PCM is the most widespread and well-understood digital coding system for reasons of simplicity, though not efficiency (as we shall see).