ANALOG-TO-DIGITAL CONVERSION The Pulse Code Modulation (PCM) Technique By Dr. Ernest Simo 1.0 Nyquist Sampling The Sampling Process Nyquist Theorem requires that the time-domain speech signal be sampled at a minimum rate of twice the highest frequency component of the waveform. This is to prevent distortion (aliasing) of the speech signal during the recovery process at the receiver. CODE: AN INTRODUCTION By Dr. Ernest Simo © 1999 DR. ERNEST SIMO - SPACE2000