Abstract
Classification of speech coding algorithms is not an easy task, and can be made using very different criteria. We usually distinguish them depending on the target bandwidth. Thus, we talk about telephonic speech coding or just speech coding, when referring to the coding of a speech signal between 300 and 3400 Hz and wideband speech coding when we talk about 7 KHz bandwidth. Both categories have up to now been considered separately. Moreover, wideband speech coding has often been covered by an extension of the telephonic speech algorithms using subband filtering. The cross-fertilization process that takes place when facing a global vision of both scenarios can one day lead to discover more efficient procedures. The present paper will have the following objective: to describe the underlying ideas behind the main coding methods.
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