Table of Contents

Foreword
1 Scope
2 Normative references
3 Definitions, symbols and abbreviations
   3.1 Definitions
   3.2 Symbols
   3.3 Abbreviations
4 General
5 Functions on the transmit (TX) side
   5.1 Background acoustic noise evaluation
   5.2 Modification of the speech encoding
       algorithm during SID frame generation
   5.3 SID-frame encoding
6 Functions on the receive (RX) side
   6.1 Averaging and decoding of the LP and
       fixed codebook gain parameters
   6.2 Comfort noise generation and updating
7 Computational details
History

Abstract

Defines 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 enhanced full rate speech traffic channels. The requirements described in this ETS are mandatory for implementation in all GSM MSs capable of supporting the enhanced full rate speech traffic channel. The receiver requirements are mandatory for implementation in all GSM BSSs capable of supporting the enhanced full rate speech traffic channel, the transmitter requirements only for those where downlink DTX will be used.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	SMG 2
Supersedes	PRETS 300 728 : NOV 96