This page is optimized for mobile devices, if you would prefer the desktop version just click here

Pulse code modulation

This module prefaces the subsequent modules on differential pulse code modulation (DPCM). In this module, the standard technique known as pulse code modulation (PCM) is described.

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 andamplitude to reconstruct an approximation of the input signal. Note that transmission may employ the use of additionalencoding and decoding, as with entropy codes. PCM is the most widespread and well-understood digital coding systemfor reasons of simplicity, though not efficiency (as we shall see).

Standard PCM system

<< Chapter < Page Page > Chapter >>

Read also:

OpenStax, An introduction to source-coding: quantization, dpcm, transform coding, and sub-band coding. OpenStax CNX. Sep 25, 2009 Download for free at http://cnx.org/content/col11121/1.2

Google Play and the Google Play logo are trademarks of Google Inc.