Adaptive Differential Pulse Code Modulation

method of compression for sound data

Pulse-code modulation (PCM) is a digital representation of an analog signal where the magnitude of the signal is sampled regularly at uniform intervals, then quantized to a series of symbols in a digital (usually binary) code. PCM has been used in digital telephone systems and is also the standard form for digital audio in computers and the compact disc red book format. It is also standard in digital video, for example, using ITU-R BT.601. However, straight PCM is not typically used for video in consumer applications such as DVD or DVR because it requires too high a bit rate (PCM audio is supported by the DVD standard but rarely used). Instead, compressed variants of PCM are normally employed. However, many Blu-ray Disc and HD-DVD movies use uncompressed PCM for audio. Very frequently, PCM encoding facilitates digital transmission from one point to another (within a given system, or geographically) in serial form.
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(new spell.=adaptive differenzial pulse code Modulation) Adaptive Differential Pulse Code Modulation, method for compressing sound data

Differential pulse-code modulation in which the prediction algorithm is adjusted in accordance with specific characteristics of the input signal.