Table of Contents

Foreword
1 Scope
2 Normative References
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 System description
  4.1 Audio facilities
  4.2 Audio encoding
  4.3 Audio decoding
  4.4 Relative level
5 Speech transmission characteristics
  5.1 Handset mode
  5.2 Headset mode
  5.3 Hands-free mode (single user)
  5.4 Hands-free mode (multiple users)
Annex A (normative): Test methods
    A.1 General conditions for testing
    A.2 Testing of transmission requirements
Annex B (informative): Test Methods for Delay measurement
    B.1 Introduction
    B.2 Cross-correlation method
    B.3 Method based on group delay
Annex C (informative): Audio alignment and practical
        installation guides
    C.1 Introduction
    C.2 Audio alignment and sensitivity-frequency
        characteristics
    C.3 Practical installation criteria
Annex D (informative): Bibliography
History

Abstract

Specifies the audio characteristics of terminals designed to support the audiographic conference teleservice as specified in ETS 300 675 [1].

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	MTA
Supersedes	PRETS 300 807 : AUG 97