Definitions for "Pulse-code Modulation"
Modulation in which a signal is sampled, and the magnitude (with respect to a fixed reference) of each sample is quantized and digitized for transmission over a common transmission medium.
A modulation system in which the standard values of a quantized wave are indicated by a series of coded pulses.
A straightforward, uncompressed, coding method in which analog signals are sampled at regular intervals and each sample is represented by a digital number representing the amplitude at that instant in time. Sampling is done at a frequency at least 2 times the highest frequency of interest, and the digital number must have a sufficient number of bits to capture and reconstruct the essential qualities of the audio signal (dynamic range, low distortion and noise, etc.). E.G. normal CD's are recorded using a sampling frequency of 44.1 kHz using a 16 bit digital number. See: Bit, Compression.