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Linear pulse code modulation (LPCM) is a method for digitally encoding uncompressed audio information, where audio waveforms are represented by a sequence of amplitude values from a sample on a linear scale in which the values are proportional to the amplitudes, as opposed to being the log of the amplitudes. This means that the values are linearly quantized, thus approximating a very large set of possible values with a relatively small set of values that may be integers or even discrete symbols.
LPCM is also used as a collective reference to audio formats that occur as a result of using this encoding method. Pulse code modulation (PCM), a more general method of encoding, is often used to describe LPCM. LPCM is capable of very high throughput.
The sampled audio signals in LPCM are represented by one of a fixed number of values in the PCM. LPCM audio is coded using a combination of values such as:
Formats that use LPCM data include AES3, Au file format, raw audio, WAV, AC3 (Dolby Digital), MPEG-audio, and audio interchange file format (AIFF). LPCM is also a part of the DVD (1995) and Blue-Ray (2006) sound and video recording standards, and is defined as part of a number of other digital video and audio storage formats.