SSH EN 301 706 V7.1.1:1999

Digital cellular telecommunications system (Phase 2+) (GSM); Comfort noise aspects for Adaptive Multi-Rate (AMR) speech traffic channels (GSM 06.92 version 7.1.1 Release 1998)

Scope

The present document gives the detailed requirements for the correct operation of the background acoustic noise evaluation, noise parameter encoding/decoding and comfort noise generation in Mobile Stations (MSs) and Base Station Systems (BSSs) during Discontinuous Transmission (DTX) on adaptive multi-rate full rate and half rate speech traffic channels. The requirements described in the present document are mandatory for implementation in all GSM MSs capable of supporting the adaptive multi-rate full rate and half tate speech traffic channels. The receiver requirements are mandatory for implementation in all GSM BSSs capable of supporting the adaptive multi-rate full rate and half rate speech traffic channels, the transmitter requirements only for those where downlink DTXwill be used.