Back تضمين نبضي مرمز Arabic Импулсно-кодова модулация Bulgarian Modulació per impulsos codificats Catalan Pulzně kódová modulace Czech Pulse Code Modulation Danish Puls-Code-Modulation German Impulskodigo-modulado Esperanto Modulación por impulsos codificados Spanish Impulsskoodmodulatsioon Estonian PCM Basque
| Filename extension |
.L16, .WAV, .AIFF, .AU, .PCM[1] |
|---|---|
| Internet media type | |
| Type code | "AIFF" for L16,[1] none[3] |
| Magic number | Varies |
| Type of format | Uncompressed audio |
| Contained by | Audio CD, AES3, WAV, AIFF, AU, M2TS, VOB, and many others |
| Open format? | Yes |
| Free format? | Yes[5] |
| Passband modulation |
|---|
 |
| Analog modulation |
| Digital modulation |
| Hierarchical modulation |
| Spread spectrum |
| See also |
Pulse-code modulation (PCM) is a method used to digitally represent analog signals. It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications. In a PCM stream, the amplitude of the analog signal is sampled at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps.
Linear pulse-code modulation (LPCM) is a specific type of PCM in which the quantization levels are linearly uniform.[5] This is in contrast to PCM encodings in which quantization levels vary as a function of amplitude (as with the A-law algorithm or the μ-law algorithm). Though PCM is a more general term, it is often used to describe data encoded as LPCM.
A PCM stream has two basic properties that determine the stream's fidelity to the original analog signal: the sampling rate, which is the number of times per second that samples are taken; and the bit depth, which determines the number of possible digital values that can be used to represent each sample.
- ^ a b Alvestrand, Harald Tveit; Salsman, James (May 1999). "RFC 2586 – The Audio/L16 MIME content type". The Internet Society. doi:10.17487/RFC2586. Retrieved March 16, 2010.
{{cite journal}}: Cite journal requires|journal=(help) - ^ Casner, S. (March 2007). "RFC 4856 – Media Type Registration of Payload Formats in the RTP Profile for Audio and Video Conferences – Registration of Media Type audio/L8". The IETF Trust. doi:10.17487/RFC4856. Retrieved March 16, 2010.
{{cite journal}}: Cite journal requires|journal=(help) - ^ a b Bormann, C.; Casner, S.; Kobayashi, K.; Ogawa, A. (January 2002). "RFC 3190 – RTP Payload Format for 12-bit DAT Audio and 20- and 24-bit Linear Sampled Audio". The Internet Society. doi:10.17487/RFC3190. Retrieved March 16, 2010.
{{cite journal}}: Cite journal requires|journal=(help) - ^ "Audio Media Types". Internet Assigned Numbers Authority. Retrieved March 16, 2010.
- ^ a b "Linear Pulse Code Modulated Audio (LPCM)". Library of Congress. April 19, 2022. Retrieved September 5, 2022.
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