Sub-band coding: Difference between revisions

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'''Sub-band coding''' is any form of [[transform coding]] that breaks a signal into a number of different [[frequency band]]s and encodes each one independently. It can be used with [[audio compression]] so that parts of the signal which the [[ear]] cannot detect are removed (e.g., a quiet sound masked by a loud one). The remaining signal is encoded using variable bit-rates with more bits per sample being used in the mid frequency range.
 
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==A basic SBC scheme==
 
 
[[Image:sbc.fig1.gif]]
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This is a basic, generic sketch of how SBC works. Notice that we haven't looked at how much computation it takes to do this. For practical systems that need to run in real time, computation is a major issue, and is usually the main constraint on what can be done.
 
Over the last five to ten years, SBC systems have been developed by many of the key companies and laboratories in the audio industry. Beginning in the late 1980's1980s, a standardization body of the ISO called the Motion Picture Experts Group (MPEG) developed generic standards for coding of both audio and video.
 
== External links ==
* [http://www.otolith.com/otolith/olt/sbc.html Sub-Band Coding Tutorial]
 
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[[Category:Data compression]]
[[Category:Audio engineering]]
[[Category:Signal processing]]
 
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[[de:Teilbandkodierung]]