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23、TS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-4953-B i TABLE OF CONTENTS 1 OVERVIEW _ 1 1.1 SCOPE _ 1 1.2 COMPLIANCE TO HEARING LOSS CATEGORIES _ 1 1.3 MEASUREMENT REQUIREMENTS _ 1 1.4 OTHER TELEPHONY PERFORMANCE CONSIDERATIONS _ 1 1.5 SAFETY PERFORMA
24、NCE CONSIDERATIONS _ 1 1.6 ENVIRONMENTAL CONSIDERATIONS _ 1 1.7 CATEGORIES OF CRITERIA _ 1 2 NORMATIVE REFERENCES _ 2 3 DEFINITIONS ABBREVIATIONS, AND ACRONYMS, _ 3 3.1 DEFINITIONS _ 3 3.2 ABBREVIATIONS AND ACRONYMS _ 4 4 PERFORMANCE REQUIREMENTS SUMMARY _ 5 4.1 NARROWBAND AND WIDEBAND HANDSET PERFO
25、RMANCE REQUIREMENTS SUMMARY _ 5 4.2 NARROWBAND AND WIDEBAND SPEAKERPHONE PERFORMANCE REQUIREMENTS SUMMARY _ 8 5 HANDSET ACOUSTIC REQUIREMENTS AND TESTING PROCEDURES _ 11 5.1 MAXIMUM RECEIVER VOLUME MEASUREMENT _ 11 5.1.1 Requirements _ 11 5.1.2 Test Procedure _ 11 5.2 MAXIMUM ACOUSTIC RINGER LEVEL M
26、EASUREMENT _ 12 5.2.1 Requirement _ 12 5.2.2 Test Procedure _ 12 5.3 HANDSET ACOUSTICS FOR HEARING LOSS CATEGORIES _ 12 5.3.1 Requirements _ 13 5.3.2 Test Procedure _ 14 5.4 RINGER ACOUSTICS FOR HEARING LOSS CATEGORIES _ 16 5.4.1 Requirement _ 16 5.4.2 Test Procedure _ 17 5.5 NON-IMPAIRED HEARING TE
27、LEPHONE ACOUSTICS _ 18 5.5.1 Requirements _ 18 5.5.2 Test Procedure _ 18 5.6 ACOUSTIC HEARING AID COMPATIBILITY PERFORMANCE _ 18 5.6.1 Requirement _ 18 5.6.2 Test Procedure _ 19 5.7 TIA1083 HEARING AID COMPATIBILITY (HAC) PERFORMANCE _ 19 5.7.1 Requirement _ 19 5.7.2 Test Procedure _ 19 5.8 OTHER OP
28、ERATIONAL ISSUES _ 19 6 SPEAKERPHONE ACOUSTIC REQUIREMENTS AND TESTING PROCEDURES _ 20 6.1 MAXIMUM RECEIVER VOLUME MEASUREMENT _ 20 ANSI/TIA-4953-B ii 6.1.1 Requirements _ 20 6.1.2 Test Procedure _ 21 6.2 MAXIMUM ACOUSTIC RINGER LEVEL MEASUREMENT _ 21 6.3 SPEAKERPHONE ACOUSTICS FOR HEARING LOSS CATE
29、GORIES _ 21 6.3.1 Requirements _ 21 6.3.2 Test Procedure _ 23 6.4 RINGER ACOUSTICS FOR HEARING LOSS CATEGORIES _ 24 6.5 NON-IMPAIRED HEARING SPEAKERPHONE ACOUSTICS _ 24 6.5.1 Requirements _ 24 6.5.2 Test Procedure _ 24 ANNEX A. (NORMATIVE) GENERAL INFORMATION _ 25 A.1 CONVERSATIONAL GAIN _ 25 A.2 MA
30、XIMUM RECEIVER VOLUME _ 25 A.3 NOMINAL VOLUME CONTROL SETTING _ 25 A.4 NOMINAL TONE CONTROL SETTING _ 25 A.5 HIGH FREQUENCY EMPHASIS (HFE) _ 26 A.6 HEARING LOSS CATEGORIES _ 27 A.7 RECEIVE TEST SIGNAL LEVELS _ 27 A.8 “PRE-QUALIFIED” RECEIVE SIGNALS FOR DISTORTION AND NOISE _ 27 A.8.1 Receive Signal
31、to Distortion and Noise (SDNR) _ 28 A.8.2 Receive Noise SNR _ 28 A.9 SEND, SIDETONE (HANDSET ), AND STABILITY _ 28 A.10 ACOUSTIC HEARING AID COMPATIBILITY _ 28 A.11 MAGNETIC HEARING AID COMPATIBILITY (HAC) _ 29 A.12 RINGER (ALERTER) MAXIMUM SOUND PRESSURE LEVEL _ 29 A.13 RINGER (ALERTER) HEARING LOS
32、S CATEGORIES _ 29 A.14 RECEIVE OUTPUT CONSISTENCY _ 29 A.15 SEND OUTPUT FOLLOWING RECEIVE SIGNAL _ 29 ANNEX B. (NORMATIVE) TESTING AND MEASUREMENT METHODS _ 30 B.1 RECEIVE PERFORMANCE TESTING METHODS _ 30 B.1.1 Receive Frequency Response _ 30 B.1.2 Receive Acoustic Level _ 30 B.1.3 Receive High Freq
33、uency Emphasis (HFE) _ 30 B.1.4 Receive Signal to Distortion and Noise (SDNR) _ 32 B.1.5 Receive Noise SNR _ 32 B.2 SEND PERFORMANCE TESTING METHODS _ 33 B.2.1 Send Frequency Response _ 33 B.2.2 Send Output _ 33 B.3 SIDETONE PERFORMANCE TESTING METHODS _ 33 B.3.1 Sidetone Frequency Response _ 33 B.3
34、.2 Sidetone Loudness _ 33 B.4 RECEIVE OUTPUT CONSISTENCY METHODS _ 33 B.5 SEND OUTPUT FOLLOWING RECEIVE SIGNAL METHODS_ 33 B.6 TELEPHONE STABILITY TESTING METHODS _ 34 ANSI/TIA-4953-B iii B.6.1 Analog Handset Telephone _ 34 B.6.2 Digital Telephone Handset Stability Testing Methods _ 35 B.6.3 Digital
35、 Speakerphone Stability Testing Method _ 35 B.6.4 Analog Speakerphone Stability Testing _ 35 B.7 RINGER (ALERTER) HL PERFORMANCE TESTING METHODS _ 36 B.8 TEST EQUIPMENT _ 38 B.8.1 Handset Testing Artificial Ear Couplers and Test Position _ 38 B.8.2 Analog Telephone Testing _ 38 B.8.2.1 DC Feed Circu
36、it _ 38 B.8.2.2 Ringer Test Circuit _ 38 B.8.2.3 Test Signals _ 38 ANNEX C. (INFORMATIVE) REQUIREMENTS AND MEASUREMENTS RATIONALE _ 39 C.1 TELEPHONE HANDSET MEASUREMENT EQUIPMENT _ 39 C.2 TEST SIGNAL LEVELS _ 40 C.3 HEARING LOSS CATEGORIES RATIONALE _ 40 C.3.1 Volume Control and Gain _ 41 C.3.2 Hearing Loss Frequency Response _
