Future services in the Internet have to support heterogeneous networks and end-devices. Audio and video services have to support a flexible adaptation of bitrate. MPEG-21 provides a multimedia framework that supports the "digital item adaptation" in various ways. Adaptation of the quality of a service is supported by the AQoS description scheme and the bitstream syntax description language (BSDL). Utilities exist to describe the relation between the scaling of the bitstream and the related perceived quality. The brightness, the cleanness and the wideness are proposed as dimensions to assess the quality and to derive parameters for controlling the audio transmission. A mapping of these features on the model output values (MOV?s) of the ITU assessment method PEAQ is proposed.
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