The possible application of digital signal processing in the audio field has been known and studied for many years: the first theoretical description of Pulse Code Modulation in telephony actually was written more than 40years ago!

For application of PCM in High-Fi and professional audio how‐ ever, even today weare not so far from the limits of what is technologically possible. Therefore, only relatively recently , it has become possible to develop commercially viable digital audio products.

As a consequence, only a small group of high level specialists are nowadays familiar with the theory and applications of digital audio technology.

This booklet is intended as a way to familiarize a newcomer in the field with some of the theoretical and technological aspects of PCM audio, in the simplest possible way. We hope it will encourage towards further studies in this interesting field.

SONY SERVICE CENTRE (Europe) N.V