Table of Contents

Foreword
1 Scope
2 References
3 Definitions and abbreviations
   3.1 Definitions
   3.2 Abbreviations
4 Description of Noise Suppression applied to AMR
   4.1 Applicability of Noise Suppression to Basic
       Services
5 Requirements to be assessed by Objective Means
   5.1 Bit Exactness of the Speech Encoder
   5.2 Bit Exactness of the Speech Decoder
   5.3 Impact on Speech Path Delay
   5.4 Impact on Channel Activity
6 Requirements to be assessed by subjective tests
   6.1 Impact on Speech Quality
7 Performance Objectives assessed by Objective Measures
   7.1 Impact on Active Speech Level
   7.2 Objective Speech Quality Measures
8 Interaction with supplementary services
   8.1 General
   8.2 Explicit Call Transfer (ECT)
   8.3 Call wait/Call hold
   8.4 Multiparty
   8.5 Service Announcements
9 Interaction with Alternate and Followed by services
10 Interaction with other speech services
11 Interaction with DTMF and other signalling tones
12 Interaction with Lawful Intercept
13 Interaction with TFO
Annex A (informative): Method for generating Objective
        Performance Measures
      A.1 Notations
      A.2 Test material
      A.3 Objective measures for characterization of
          NS algorithm effect
Annex B (normative): Methodology for Measuring
        Subjective SNR Improvement for CCR
Experiments
Annex C (normative): Test Plan for Checking Conformance
        to Requirements
Annex D (informative): Change history

Abstract

Describes recommended minimum performance requirements for noise suppression algorithms intended for application in conjunction with the AMR speech encoder. This specification is for guidance purposes.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	3 GPPSA