Speech coding: Difference between revisions

Revision as of 23:08, 16 August 2003

Revision as of 04:51, 29 January 2004

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'''Speech coding''' is the [[audio compression|compression]] of speech (into a [[code]]) for [[telecommunication|transmission]] using [[audio signal processing]] and [[speech processing]] techniques.

The two most important applications using speech coding are [[mobile phone|mobile phones]]s and [[internet phone|internet phones]]s.

The techniques used in speech coding are similar to that in [[audio compression]] and [[audio coding]] where knowledge in [[psychoacoustics]] is used to transmit only data that is relevant to the human auditory system. For example, in narrow-band speech coding, only information in the frequency band 400Hz to 3500Hz is transmitted but the reconstructed signal is still adequate for intelligibility.

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Major subfields:

* [[Wide-band speech coding]]

* Wide-band speech coding [http://www.wikipedia.org/w/wiki.phtml?title=Wide-band_speech_coding&action=edit&redirect=no create an article on this topic]

** [[GSM]]

** [[NMT]]