Audio codec: Difference between revisions
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{{Short description|Device or program that encodes/decodes audio data in some bitstream format}} | {{Short description|Device or program that encodes/decodes audio data in some bitstream format}} | ||
An '''audio codec''' is a device or computer program capable of encoding or decoding a digital data stream (a [[codec]]) that encodes or decodes audio.<ref>{{cite web |url=https://www.microsoft.com/windows/windowsmedia/player/faq/codec.mspx |title=Using codecs |publisher=Microsoft |access-date=2009-12-21}}</ref><ref>{{cite web |url=http://desktopvideo.about.com/od/glossary/g/codec.htm |title=About.com - Codec |publisher=About.com |access-date=2009-12-21 |archive-date=2015-04-05 |archive-url=https://web.archive.org/web/20150405161202/http://desktopvideo.about.com/od/glossary/g/codec.htm |url-status=dead }}</ref><ref>{{cite web |url=http://www.afterdawn.com/glossary/terms/codec.cfm | title=Glossary - Codec |publisher=Afterdawn.com |access-date=2009-12-21}}</ref><ref>{{cite web |title=Ubuntu Documentation - What is a codec? |url=https://help.ubuntu.com/8.04/musicvideophotos/C/codecs.html |url-status=dead |archive-url=https://web.archive.org/web/20120219101738/https://help.ubuntu.com/8.04/musicvideophotos/C/codecs.html |archive-date=February 19, 2012 |access-date=2009-12-21 |publisher=Ubuntu Documentation Team}}</ref> In software, an audio codec is a computer program implementing an algorithm that [[Audio compression (data)|compresses and decompresses]] digital audio data according to a given audio file or streaming media [[audio coding format]]. The objective of the algorithm is to represent the high-fidelity audio signal with a minimum number of bits while retaining quality. This can effectively reduce the storage space and the [[Bandwidth (computing)|bandwidth]] required for transmission of the stored audio file. Most software codecs are implemented as [[Library (computing)|libraries]] which interface to one or more [[Media player (software)|multimedia players]]. Most modern audio compression algorithms are based on [[modified discrete cosine transform]] (MDCT) coding and [[linear predictive coding]] (LPC). | An '''audio codec''' is a device or computer program capable of encoding or decoding a digital data stream (a [[codec]]) that encodes or decodes [[Digital audio|audio]].<ref>{{cite web |url=https://www.microsoft.com/windows/windowsmedia/player/faq/codec.mspx |title=Using codecs |publisher=Microsoft |access-date=2009-12-21}}</ref><ref>{{cite web |url=http://desktopvideo.about.com/od/glossary/g/codec.htm |title=About.com - Codec |publisher=About.com |access-date=2009-12-21 |archive-date=2015-04-05 |archive-url=https://web.archive.org/web/20150405161202/http://desktopvideo.about.com/od/glossary/g/codec.htm |url-status=dead }}</ref><ref>{{cite web |url=http://www.afterdawn.com/glossary/terms/codec.cfm | title=Glossary - Codec |publisher=Afterdawn.com |access-date=2009-12-21}}</ref><ref>{{cite web |title=Ubuntu Documentation - What is a codec? |url=https://help.ubuntu.com/8.04/musicvideophotos/C/codecs.html |url-status=dead |archive-url=https://web.archive.org/web/20120219101738/https://help.ubuntu.com/8.04/musicvideophotos/C/codecs.html |archive-date=February 19, 2012 |access-date=2009-12-21 |publisher=Ubuntu Documentation Team}}</ref> In software, an audio codec is a computer program implementing an algorithm that [[Audio compression (data)|compresses and decompresses]] digital audio data according to a given audio file or streaming media [[audio coding format]]. The objective of the algorithm is to represent the high-fidelity audio signal with a minimum number of bits while retaining quality. This can effectively reduce the storage space and the [[Bandwidth (computing)|bandwidth]] required for transmission of the stored audio file. Most software codecs are implemented as [[Library (computing)|libraries]] which interface to one or more [[Media player (software)|multimedia players]]. Most modern audio compression algorithms are based on [[modified discrete cosine transform]] (MDCT) coding and [[linear predictive coding]] (LPC). | ||
In hardware, audio codec refers to a single device that encodes analog audio as digital signals and decodes digital back into analog. In other words, it contains both an [[analog-to-digital converter]] (ADC) and [[digital-to-analog converter]] (DAC) running off the same [[clock signal]]. This is used in [[sound card]]s that support both audio in and out, for instance. Hardware audio codecs send and receive digital data using [[Bus (computing)|buses]] such as [[AC'97]], [[SoundWire]],<ref>{{cite web | url=https://www.mipi.org/blog/mipi-soundwire-v1.2-boosts-flexibility-for-integrating-mobile-audio-interfaces | title=MIPI SoundWire v1.2 | Integrating Mobile Audio Interfaces }}</ref> [[I²S]], [[Serial Peripheral Interface Bus|SPI]], [[I²C]], etc. Most commonly the digital data is [[linear PCM]], and this is the only format that most codecs support, but some legacy codecs support other formats such as [[G.711]] for telephony. | In hardware, audio codec refers to a single device that encodes analog audio as digital signals and decodes digital back into analog. In other words, it contains both an [[analog-to-digital converter]] (ADC) and [[digital-to-analog converter]] (DAC) running off the same [[clock signal]]. This is used in [[sound card]]s that support both audio in and out, for instance. Hardware audio codecs send and receive digital data using [[Bus (computing)|buses]] such as [[AC'97]], [[SoundWire]],<ref>{{cite web | url=https://www.mipi.org/blog/mipi-soundwire-v1.2-boosts-flexibility-for-integrating-mobile-audio-interfaces | title=MIPI SoundWire v1.2 | Integrating Mobile Audio Interfaces }}</ref> [[I²S]], [[Serial Peripheral Interface Bus|SPI]], [[I²C]], etc. Most commonly the digital data is [[linear PCM]], and this is the only format that most codecs support, but some legacy codecs support other formats such as [[G.711]] for telephony. | ||
Latest revision as of 13:14, 15 August 2025
Template:Short description An audio codec is a device or computer program capable of encoding or decoding a digital data stream (a codec) that encodes or decodes audio.[1][2][3][4] In software, an audio codec is a computer program implementing an algorithm that compresses and decompresses digital audio data according to a given audio file or streaming media audio coding format. The objective of the algorithm is to represent the high-fidelity audio signal with a minimum number of bits while retaining quality. This can effectively reduce the storage space and the bandwidth required for transmission of the stored audio file. Most software codecs are implemented as libraries which interface to one or more multimedia players. Most modern audio compression algorithms are based on modified discrete cosine transform (MDCT) coding and linear predictive coding (LPC).
In hardware, audio codec refers to a single device that encodes analog audio as digital signals and decodes digital back into analog. In other words, it contains both an analog-to-digital converter (ADC) and digital-to-analog converter (DAC) running off the same clock signal. This is used in sound cards that support both audio in and out, for instance. Hardware audio codecs send and receive digital data using buses such as AC'97, SoundWire,[5] I²S, SPI, I²C, etc. Most commonly the digital data is linear PCM, and this is the only format that most codecs support, but some legacy codecs support other formats such as G.711 for telephony.
See also
- Comparison of audio coding formats
- List of codecs
- List of open-source codecs
- Transcoding
- Video codec
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