scope:

The present document provides speech & audio transmission performance requirements and measurement methods for handsfree functions of superwideband/fullband terminals, including conferencing terminals. The present document provides requirements in order to optimize the end to end quality perceived by users.

Users become more sensitive to voice and music quality (for music used in conversational services) when using ICT/terminal equipment and so are more demanding for further enhancement especially further extension of the audio coded bandwidth.

For instance, this is the case for high quality conferencing services with music on hold, better background environment rendering and longer duration than normal point to point calls.

Standardized superwideband and fullband coders are now available, some being also compatible with wideband coders.

The present document will consider only conversational services (that may be mixed with other services) and does not cover the streaming-only services.

Such applications include:

• Speech and audio communication including conferencing using high quality handsfree systems.

• Bandwidth extension which may allow usage for some mixed content applications.

• Superwideband enhancement coupled with stereo/multichannel.