In CELP, the modelling is divided in two stages, a linear predictive stage that models the spectral envelope and code-book based model of the residual of the linear predictive model. The most common speech coding scheme is Code-Excited Linear Predictive ( CELP) coding, which is used for example in the GSM standard. They can be seen as a kind of speech encoding, requiring only 8 bits per sample but giving effectively 12 bits of resolution. The A-law algorithm and the Mu-law algorithm are used in nearly all land-line long distance telephone communications. ![]() In addition, most speech applications require low coding delay, as long coding delays interfere with speech interaction. The more abstract concept of pleasantness of degraded speech is a different property than intelligibility, since it is possible that degraded speech is completely intelligible, but subjectively annoying to the listener. that are all important for perfect intelligibility. It should be emphasised that the intelligibility of speech includes, besides the actual literal content, also speaker identity, emotions, intonation, timbre etc. ![]() In speech coding, the most important criterion is preservation of intelligibility and "pleasantness" of speech, with a constrained amount of transmitted data. In addition, some auditory information which is relevant in audio coding can be unnecessary in the speech coding context. However, speech coding differs from audio coding in that there is a lot more statistical information available about the properties of speech. 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. 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. The two most important applications using speech coding are mobile phones and internet phones. Speech coding is the compression of speech (into a code) for transmission with speech codecs that use audio signal processing and speech processing techniques.
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