ANALOG-TO-DIGITAL CONVERSION The Pulse Code Modulation (PCM) Technique By Dr. Ernest Simo 3.0 Encoding Samples into Bits Pulse Code Modulation Note that the sampling process is essentially defining the Time-axis (X-axis) while the Quantization process is defining the Amplitude-axis (Y-axis). This "cartesian coordinate system" allows us to define in a unique manner, any point in time (X-axis) at any level (Y-axis) of our speech waveform. This process is referred to as Pulse Code Modulation or PCM. CODE: AN INTRODUCTION By Dr. Ernest Simo © 1999 DR. ERNEST SIMO - SPACE2000