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However, speech coding differs from audio coding in that there is a lot more statistical information available about the properties of speech. In addition, some auditory information which is relevant in audio coding can be unnecessary in the speech coding context. In speech coding, the most important criterion is always preservation of intelligibility of speech, with a constrained amount of transmitted data.
It should be emphasised that the intelligibility of speech includes, besides the actual literal content, also speaker identity, emotions, intonation, [[timbre]] etc. that are all important for perfect intelligibility.
In addition, most speech applications require low coding delay, as long coding delays interfere with speech interaction.
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