1、 TIA-5050 January 2018Telecommunications Communications Products Receive Volume Control Requirements for Wireless (Mobile) Devices ANSI/TIA-5050-2018 APPROVED: JANUARY 17, 2018 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misundersta
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23、BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-5050 i TABLE OF CONTENTS FOREWORD _ III INTRODUCTION_ IV 1 SCOPE _ 1 2 NORMATIVE REFERENCES _ 2 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS _ 3 3.1 DEFINITIONS . 3 3.2 ABBREVIATIONS AND ACRONYMS 4 4 TESTING CONSIDERATIONS _ 5 4.1 ADJUSTABLE FREQU
24、ENCY RESPONSE. 5 4.2 ACOUSTIC TEST INTERFACE EQUIPMENT . 5 4.3 HANDSET POSITIONING AND MOUNTING FORCE 5 4.4 TEST SIGNAL AND ANALYSIS . 5 4.5 NARROWBAND AND WIDEBAND TRANSMISSION MODES 5 4.5.1 Narrowband mode testing 5 4.5.2 Wideband mode testing 6 4.6 AIR INTERFACE 6 4.7 PRECAUTIONS . 6 4.8 TEST ARR
25、ANGEMENT 6 5 TECHNICAL REQUIREMENTS _ 7 5.1 RECEIVE VOLUME CONTROL PERFORMANCE 7 5.1.1 Requirement .7 5.1.2 Method of Measurement 7 5.2 RECEIVE DISTORTION AND NOISE PERFORMANCE . 8 5.2.1 Requirement .8 5.2.2 Measurement Method 8 5.3 RECEIVE ACOUSTIC FREQUENCY RESPONSE PERFORMANCE . 9 5.3.1 Requireme
26、nt .9 5.3.2 Measurement Method 12 ANNEX A (NORMATIVE) PULSED NOISE SIGNAL-TO-DISTORTION-AND-NOISE RATIO (PN-SDNR) _ 13 A.1 MEASUREMENT DESCRIPTION . 13 A.2 STIMULUS MEASUREMENT . 14 A.3 DISTORTION MEASUREMENT . 15 ANNEX B (NORMATIVE) DRP TO FF TRANSFER FUNCTIONS _ 16 B.1 DRP TO FF TRANSFER FUNCTION
27、16 B.2 DRP TO DF TRANSFER FUNCTION . 18 ANSI/TIA-5050 ii ANNEX C (INFORMATIVE) CONVERSATIONAL GAIN _ 20 C.1 THE HAC ACT . 20 C.2 CONSUMER CONFUSION 20 C.3 INVESTIGATION 21 C.4 IEEE STD 269 21 C.5 TEST SIGNAL LEVEL 21 C.6 CONVERSATIONAL GAIN PERFORMANCE REQUIREMENT 21 C.7 BENEFITS OF USING CONVERSATI
28、ONAL GAIN . 22 ANNEX D (INFORMATIVE) BIBLIOGRAPHY _ 23 TABLE OF FIGURES Figure 1 Test Arrangement . 6 Figure 2 Narrowband Receive Frequency Response Limits 10 Figure 3 Wideband Receive Frequency Response Limits 11 Figure A.1 Stimulus, Measurement, and Analysis Bands for PN-SDNR 14 Figure B.1 DRP to
29、FF Transformation Curve 17 Figure B.2 DRP to DF Transformation Curve 19 TABLE OF TABLES Table 1 Narrowband Receive Frequency Response Limits 10 Table 2 Wideband Receive Frequency Response Limits . 11 Table A.1 Stimulus and Stimulus Measurement Bands for PN-SDNR 14 Table A.2 Distortion Analysis Notch
30、 Bands for PN-SDNR . 15 Table B.1 DRP to FF Transformation Values at 1/12 Octave Center Frequencies 16 Table B.2 DRP to FF Transformation Values at R40 Frequencies 17 Table B.3 DRP to DF Transformation Values at 1/12 Octave Center Frequencies . 18 Table B.4 DRP to DF Transformation Values at R40 Fre
31、quencies 19 ANSI/TIA-5050 iii Foreword (This foreword is not part of this Standard.) This document is a TIA Telecommunications standard produced by Working Group TR-41.3.14 of Committee TR-41. This standard was developed in accordance with TIA procedural guidelines, and represents the consensus posi
32、tion of the Working Group and its parent Subcommittee TR-41.3, which served as the formulating group. There are three annexes in this Standard. Annex A and Annex B are normative and are considered part of this Standard. Annex C is informative and is not considered part of this Standard. The leadersh
33、ip of the TR-41.3.14 Accessibly Working Group (Chair: James Bress, AST Technology Labs, Inc.) acknowledges the written contributions provided by the following individuals in the development of this standard. Organization Representative ANSI/TIA-5050 AST Technology Labs Inc. James Bress Editor AST Te
34、chnology Labs Inc. Don McKinnon Editor Gallaudet University RERC on Telecommunications Access Linda Kozma-Spytek Innovation, Science and Economic Development Canada Jason Nixon Knowles Corporation Scott Isabelle Whitesell Consulting LLC Steve Whitesell Suggestions for improvement of this Standard ar
35、e welcome. They should be sent to: Telecommunications Industry Association Technology and Standards Department Suite 200 1320 North Courthouse Road Arlington, VA 22201 ( http:/www.tiaonline.org ) ANSI/TIA-5050 iv Introduction Telephones with handsets connecting to the Public Switched Telephone Netwo
36、rk (PSTN) via a wireline interface (“wireline handset telephones”) are required by FCC CFR Part 68 (USA) and CS-03 (Canadian) rules to provide a specified amount of volume control gain relative to a nominal output level. These wireline telephones may have an analog or digital network interface and t
37、he handset may have a corded or “cordless” (e.g., DECT, WiFi) connection to the base unit that connects to the telephone network. FCC rules reference outdated TIA telephony standards including ANSI/TIA-470-A (analog interface) and ANSI/TIA-579 (digital interface) for measurement methods to establish
38、 acoustic output levels for nominal volume control and output levels for the required minimum volume control acoustic gain. TIA published ANSI/TIA-4965 (“Receive Volume Control Requirements for Digital and Analog Wireline Handset Terminals”) in 2012 with the intent that ANSI/TIA-4965 would replace t
39、he outdated TIA standard references related to volume control measurements. Canada has adopted ANSI/TIA-4965 as the new method of measurement and the FCC in the USA is in the final stages of the rule making process to also adopt ANSI/TIA-4965 as the new measurement requirements for wireline telephon
40、e handsets. ANSI/TIA-4965 specifies a measurement method based on the concept of “Conversational Gain” whereby the acoustic output level of a handset with volume control gain applied is measured with modern, updated methods, and referenced to an acoustic level of 70 dBSPL. See Annex-C (Informative)
41、Conversational Gain for details regarding Conversation Gain and associated reference levels. The FCC has circulated the awareness of ANSI/TIA-4965 throughout the telephony industry as part of the FCCs rule making process. During the comment periods there has been widespread support for this change a
42、nd little or no challenges or dissent. The original USA and Canadian creation of telephone volume control rules was championed by hearing advocacy groups to ensure the rules of the 1934 (and 1996) telecommunications acts were enforced such that all people had access to telephone services, including
43、people with hearing impairment. The influence of wireless networks and devices used to access services is well-known throughout the world. For a rapidly increasing number of people, the only telephone they use or have access to for voice calls is their personal wireless (e.g., cellular) telephone ha
44、ndset. For the same reasons that volume control gain was important for wireline handset telephones, volume control gain is important for wireless network interface handset telephones (“wireless handset telephones”). This standard is based on the measurement methods established in ANSI/TIA-4965. The
45、acoustic related measurement methods are identical to ANSI/TIA-4965 except that two force levels are specified for placing the handset against the ear pinna of the Head and Torso Simulator (HATS). The 8 N force is similar to the 10 N force used in ANSI/TIA-4965 and is meant to be representative of a
46、 handset held to an ear without a hearing device (e.g., hearing aid, cochlear implant). The 2 N force is meant to simulate the handset being loosely coupled to the microphone of a hearing device. The Conversational Gain requirements differ for these two usage conditions. The only other changes requi
47、red for this wireless handset telephone volume control standard were related to the establishment of a voice call connection over the wireless network interface vs. ANSI/TIA-4965s requirements for call connections over wireline (analog or digital) network interfaces. TIA developed and published this
48、 standard to provide a solution to the current lack of voluntary or regulatory requirements for volume control gain for wireless handset telephones. By publishing this standard, TIA does not advocate for or against regulatory adoption of rules regarding wireless handset telephone volume control gain. Instead, TIAs intent in developing and publishing t
