Abstract
Speech and audio coding standards are defined in international organizations having wide range of activities, only part of them dealing with bit rate compression of speech and audio. The uit (International Telecommunication Union) deals with interactive communication standards, the etsi (European Telecommunications Stan dards Institute) with mobile communication standards in Europe while multimedia communication standards are under the responsability of the ISO (International Organization for Standardization). After a brief description of the standardization mechanism, we will review the features of speech and audio compression schemes (bit rates, quality, complexity and delay) and the main applications of these standards. A list of the compression standards, already adopted or in the course of definition, will be provided for each normalization organization. Finally, this paper gives the orientations or trends which are emerging in the field of audio compression standardization.
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