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
4.1 Categories of Criteria x 4.2 General Testing Considerations x 4.3 Test Circuits and Setups x 4.4 Transmission Performance xv
A.1 Send Noise Curves xxx Annex B Receive Noise Curve xxxii
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.6 Table of Results xlviii
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.
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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