Sp-3-4350. 120-rv3 (to become ansi/tia-470. 120-C) Draft 22a ast ballot Comments with track changes on Telecommunications Telephone Terminal Equipment Transmission Requirements for Analog Speakerphones



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SP-3-4350.120-RV3

(to become ANSI/TIA-470.120-C)

Draft 22a

AST Ballot Comments with track changes on

Telecommunications

Telephone Terminal Equipment

Transmission Requirements for Analog Speakerphones

Formulated under the cognizance of TIA Subcommittee TR-41.3,


Analog and Digital Wireline Terminals

With the approval of TIA Engineering Committee TR-41,


User Premises Telecommunications Requirements

TABLE OF CONTENTS

1 SCOPE v

2 NORMATIVE REFERENCES vi

3 Abbreviations, Acronyms, AND definitions vii

3.1 Abbreviations and Acronyms vii

3.2 Definitions viii

4 Technical Requirements x

4.1 Categories of Criteria x

4.2 General Testing Considerations x

4.3 Test Circuits and Setups x

4.4 Transmission Performance xv

Annex A (Normative) – Noise Curves xxx

A.1 Send Noise Curves xxx

Annex B Receive Noise Curve xxxii

Annex C (Normative) – Calculation of Loudness Ratings xxxiii

C.1 Send Loudness Rating (Handset): xxxiv

C.2 Receive Loudness Rating (Handset): xxxiv

C.3 Sidetone Masking Rating (Handset): xxxv



Annex D (Normative) – ISO R-40 Frequencies xxxvii

Annex E (Informative) – Loss Plan and Loudness Rating References and Hierarchy xxxix

Annex F (Informative) – Nominal Frequency Response Characteristics and Loudness Rating Calculations xli

Annex G (Informative) - Bibliography xlv

Annex H (Informative) – BNR Study xlvi

H.1 Objectives xlvi

H.2 Apparatus xlvi

H.3 Procedure xlvi

H.4 Preliminary Results xlvi

H.5 Recommendations xlvii

H.6 Table of Results xlviii

Annex I (Informative) – Items for Future Consideration l

I.1 Voice Switching Performance l

I.2 Acoustic Echo Canceller Performance li

I.3 Dynamic Send Background Noise Suppression li

I.4 Switching operation between speakerphone & handset mode li

I.5 Send Level and Send Level Directionality lii



Table of Figures

Figure 1 – General Test Setup For Send Measurements x

Figure 2 – General Test Setup For Receive Measurements xi

Figure 3 – Test Circuit For Send Measurements xi

Figure 4 – Test Circuit For Receive Measurements xii

Figure 5 – One Possible dc Feed Circuit xiii

Figure 6 – Artificial Line Segment xiv

Figure 7 – Send Frequency Response Limits for 2.7 km xvi

Figure 8 – Speakerphone Send LR Directionality Measurement Setup xix

Figure 9 – Speakerphone Receive Level Directionality Measurement Setup xxv

Figure 10 – Receive Frequency Response Limits for 2.7 km xxvii

Figure A.1 – Psophometric and C-Message noise weighting curves comparison xxxi

Figure A.2 – A-weighting noise weighting curve xxxii

Figure D.1 – Hierarchical Relationship between Loudness Rating and Loss Plan Standards xl

Figure E.1 – Nominal send frequency response xliii

Figure E.2 – Nominal receive frequency response xliii

Figure G.1 – Speakerphone Send Level Directionality Measurement Setup liv

Table of Tables

Table 1 – Artificial Line Segment Component Values xiv

Table 2 – Send Frequency Response Limits xvi

Table 3 – Send Loudness Rating (SLR) Limits xvii

Table 4 – Send Loudness Rating Directionality Limits. xviii

Table 5 – Limits for Send SDNR vs Frequency xix

Table 6 – Limits for Send SDNR vs Level xx

Table 7 – Send SDNR Stimulus Center Frequencies and Band Limits xx

Table 8 – Send SDNR Analysis Notch Frequency Band xx

Table 9 – Speakerphone Receive Level Limits xxiii

Table 10 – Receive Level Directionality Limits. xxiv

Table 11 – Mandatory Receive Frequency Response Limits xxvi

Table 12 – Limits for Receive SDNR vs Frequency xxvii

Table 13 – Limits for Receive SDNR vs Level xxvii

Table 14 – Receive SDNR Stimulus Center Frequencies and Band Limits xxviii

Table 15 – Receive SDNR Analysis Notch Frequency Band xxviii

Table A.1 – Psophometric weighting curve Table A.2 – C-Message weighting curve xxx

Table A.1 – Psophometric weighting curve Table A.2 – C-Message weighting curve xxx

Table A.3 – A-weighting curve xxxii

Table B.1 – ITU-T P.79 Tables 1, 2 and 3, Weighting factors for calculating loudness ratings xxxvi

Table C.1 – ISO R-40, ISO R-10,1/12th Octave and 1/3rd Octave Frequencies xxxvii

Table C.2 – ISO R-40, ISO R-10,1/12th Octave and 1/3rd Octave Frequencies (Continued) xxxviii

Table E.1 – Nominal Frequency Response Characteristics and Loudness Ratings Calculations xliv

Table FG.1 – Room noise 35 dBA User Acceptance Levels xlviii

Table FG.2 – Room noise 45 dBA User Acceptance Levels xlviii

Table FG.3 – Room noise 55 dBA User Acceptance Levels xlix

Table G.1H-1 – Speakerphone Send Level Limits lii

Table G.2H-2 – Send Level Directionality Limits. liii

FOREWORD

(This foreword is not part of this Standard.)

This document is a TIA Telecommunications standard produced by Working Group TR-41.3.10 of Committee TR-41. This standard was developed in accordance with TIA procedural guidelines, and represents the consensus position of the Working Group and its parent Subcommittee TR-41.3, which served as the formulating group.

There are nine annexes in this Standard. Annex A, Annex C and Annex D are normative and are considered part of this Standard. Annex E, Annex F, Error: Reference source not found, Annex G, Annex H and Annex I are informative and are not considered part of this Standard. (AST – proposal to delete Annex E, see annex for details)

The leadership of the TR-41.3.10 Working Group (Chair: Al Baum, Uniden) acknowledges the written contributions provided by the following individuals in the development of this standard.


Organization

Representative

TIA-470.120-C

Uniden.

Al Baum

 Editor

AST Technology labs, Inc

Don McKinnon

 Editor

Acoustics for Communications

Ron Magnuson



Advent Instruments

Dave Stenner



Atlinks

Fred Bonhomme



Consultant in Electroacoustics

John Bareham



Embarq Corporation

Amar Ray



Listen Inc.

Dan Foley



MWM Acoustics

Glenn Hess



Nortel

Miguel DeAraujo



Texas Instruments

Tom Harley



VTech Communications

Steve Whitesell



Suggestions for improvement of this standard are welcome. They should be sent to:

Telecommunications Industry Association

Engineering Department

Suite 300

250 Wilson Boulevard

Arlington, VA 22201

( http://www.tiaonline.org )


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