pulse code modulation

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(n.) A standard means of encoding audio information in a digital format by sampling the amplitude of the audio waveform at regular intervals and by representing that sample as a digital numerical value. Current standards are based on CCITT Recommendation G.711, which specifies more codes for low-frequency components and fewer codes for high-frequency components. Telephone systems in the United States and Japan use m-law encoding, whereas Europe and the rest of the world use a-law encoding. See also adaptive differential pulse code modulation.