Journal Article
Pulse-Code Modulation--An Overview
Journal of the Audio Engineering Society · Volume 52 · Issue 3 · pp. 200–215 · March 2004
Abstract
Pulse-code-modulation (PCM) encoding of digital audio signals has had a long and successful history in the era of the Compact Disc (CD). This brief survey paper argues that it forms the logical way to extend either the bandwidth or the signal-to-noise ratio of a digital audio system, or both, to encompass even higher resolution. Underpinning its operation there are the iron-clad theorems that govern both the sampling-and-reconstruction and the ditheredquantizing processes that lie at its heart. It is adaptable enough to allow fully distortion-free noise shaping to be used if wordlength reduction is necessary, provided that the wordlength is not reduced so far as to cause quantizer overload when using proper dithering.
