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'''Speech coding''' is the [[audio compression|compression]] of speech (into a [[code]]) for [[telecommunication|transmission]] with speech [[codecs]] that use [[audio signal processing]] and [[speech processing]] techniques.
The two most important applications using speech coding are [[mobile phone]]s and [[internet phone]]s.
The techniques used in speech coding are similar to that in [[audio data 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 [[narrowband]] speech coding, only information in the frequency band 400 Hz to 3500 Hz is transmitted but the reconstructed signal is still adequate for intelligibility.
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