1、 TIA-470.120-D (Revision of TIA-470.120-C) June 2017 Telecommunications Telephone Terminal Equipment Transmission Requirements for Analog Speakerphones ANSI/TIA-470.120-D-2017 APPROVED: JUNE 19, 2017 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through
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23、OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-470.120-D i TABLE OF CONTENTS FOREWORD IV INTRODUCTION V 1 SCOPE 1 1.1 Limits of this Standard for Product Evaluation 1 1.2 Environmental 1 1.3 Safety 1 2 NORMATIVE REFERENCES 2 3 A
24、BBREVIATIONS, ACRONYMS, AND DEFINITIONS 3 3.1 Definitions 3 3.2 Abbreviations and Acronyms .5 4 TESTING CONSIDERATIONS 6 4.1 General .6 4.1.1 Test Environment Background Noise .6 4.1.2 Acoustic Test Interface Equipment .6 4.1.3 Test Signals .6 4.1.4 Subjective Tests .6 4.1.5 Test Measurement Resolut
25、ion .7 4.1.6 Test Methods .7 4.2 Test Positions and Arrangements .7 4.2.1 Receive General Test Setup Arrangements .7 4.2.2 Send General Test Setup Arrangements 8 4.2.3 Send Level Directionality Test Arrangement 9 4.3 Test Circuits .10 4.3.1 Receive testing circuit .10 4.3.2 Send Testing Circuit 10 4
26、.3.3 DC Feed Circuit .11 4.3.4 Termination Impedance .11 4.3.5 Source Impedance 11 4.3.6 Artificial Lines .12 5 TECHNICAL REQUIREMENTS . 13 5.1 Categories of Criteria .13 5.2 Receive Performance 13 5.2.1 Receive Output Level 14 5.2.2 Receive Frequency Response 15 5.2.3 Receive Distortion and Noise 1
27、7 5.2.4 Receive Noise 18 5.2.5 Receive Off-Hook Single Frequency Interference (SFI) .18 5.3 Send Performance .19 ANSI/TIA-PN-470.120-D ii 5.3.1 Send Output Level .19 5.3.2 Send Level Directionality (SLD) .20 5.3.3 Send Frequency Response .20 5.3.4 Send Muting 22 5.3.5 Send Distortion and Noise .22 5
28、.3.6 Send Off-Hook Noise 23 5.3.7 Send On-Hook Noise .23 5.3.8 Send Off-Hook Single Frequency Interference (SFI) 23 5.4 Switching operation between speakerphone the send loudness rating method has been removed. Other significant changes include: 1. Changed test signals to be IEEE Std 269 real speech
29、. 2. Changed from using the “Reference Volume Control” setting to the “Nominal Volume Control”. 3. Changed frequency response limits from staircase 1/3rd octave limits to linear limits. 4. Subjective and Objective Speech Quality testing informative annex was added. 5. Added test position for cordles
30、s handset speakerphones. Finally, the structure of the document has been modified to place the requirements for receive performance before those for send performance since the establishment of the Nominal Volume Control Setting is a necessary prerequisite for many of the tests. ANSI/TIA-470.120-D 1
31、TELEPHONE TERMINAL EQUIPMENT TRANSMISSION REQUIREMENTS FOR ANALOG SPEAKERPHONES 1 SCOPE This standard provides acoustic transmission performance requirements for speakerphone equipped analog telephones intended for connection to the Public Switched Telephone Network (PSTN), analog terminal adaptors
32、(ATA) and voice gateways. These requirements should ensure compatibility and satisfactory performance to the user in a high percentage of installations. Test measurement methods reference procedures in IEEE Std 1329 where applicable. This standard is limited to single housing speakerphones intended
33、for use on a desk, table, or handheld (i.e. cordless handsets) by a single user at a distance of one half meter or closer. These requirements are not intended for multi-user conference speakerphones. While the procedures may call out specific test points within the requirements, the full range of th
34、e requirements take precedence. 1.1 LIMITS OF THIS STANDARD FOR PRODUCT EVALUATION It is recognized that there are many parameters that may influence the performance of speakerphone devices including: 1. The distance between the user and the speakerphone device 2. Users with a variety of talker leve
35、ls 3. The level and type of environmental noise 4. Non-linear processing included in the speakerphone device design (e.g., AGC, AEC) This standard establishes the performance requirements for speakerphones with the following limitations: 1. A single test position is used to simulate the distance bet
36、ween the user and speakerphone. 2. The speakerphone is tested without environmental noise present. 3. Testing is performed without consideration for any effects of non-linear processing, although such non-linear processing may be present. Subjective testing may provide additional information regardi
37、ng a speakerphone devices performance. However, the subjective test shall not be a substitution for the objective test nor a condition to pass the standard. 1.2 ENVIRONMENTAL This standard does not contain environmental requirements. Environmental requirements can be found in ANSI/TIA-571-C. 1.3 SAF
38、ETY This standard does not contain safety requirements. ANSI/TIA-PN-470.120-D 2 2 NORMATIVE REFERENCES The following standards contain provisions, which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standar
39、ds are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards. 1. ANSI/ASA S1.4 Part 1 (2014), Ele
40、ctroacoustics Sound Level Meters Part 1: Specifications. 2. ANSI/ASA S1.11 Part 1 (2014), Electroacoustics Octave-Band and Fractional-Octave-Band Filters Part 1: Specifications. 3. IEEE Std 269-2010, IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, H
41、andsets, and Headsets. 4. IEEE Std 1329-2010, Standard Method for Measuring Transmission Performance of Speakerphones. 5. IEEE Std 743-1995, IEEE Standard Equipment Requirements and Measurement Techniques for Analog Transmission Parameters for Telecommunications. 6. ITU-T Recommendation O.41 (1994-1
42、0), Psophometer for Use on Telephone-Type Circuits 7. ITU-T Recommendation P.51 (1996-08), Artificial Mouth 8. ITU-T Recommendation P.56 (2011-12), Objective Measurement of Active Speech Level ANSI/TIA-470.120-D 3 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS 3.1 DEFINITIONS For the purposes of this st
43、andard, the following definitions apply. Active Speech Level (ASL): Long term average speech level which does not include pauses or silences. It is the time integral of the instantaneous power over the active time, divided by active time, in decibels relative to the appropriate reference. (See ITU-T
44、 P.56) Artificial Mouth and Mouth Simulator: This standard uses the term “mouth simulator” synonymously with the term “artificial mouth” (ITU-T P.51), to harmonize with IEEE Std 269. Cordless: A cordless terminal does not have a cable between its handset, headset or speakerphone transducers and a ba
45、se unit that connects to the network. Electrical Test Point: The point in a battery feed circuit (see Figure 8) at which signals are applied/accessed: Receive Electrical Test Point (RETP): The point in a battery feed circuit across the 900 ohm source at which signals are applied to the phone in the
46、receive direction Send Electrical Test Point (SETP): The point in a battery feed circuit across the 900 ohm load at which signals coming from the phone in the send direction are accessed. Electrical Units: The following electrical units are used in this standard: dBm: Power level in decibels, relati
47、ve to a power of 1 mW (milliwatt). dBmp: Power level in decibels, relative to a power of 1 mW, using psophometric weighting (See Annex B). dBV: Voltage level in decibels, relative to 1 volt rms. Far-end: The term far-end is used to describe the part of the end-to-end connection opposite where the de
48、vice under test (DUT) is located. Free Field (FF): Sound field in a homogenous, isotropic medium free from boundaries. In practice, the effects of boundaries on a free field are negligible over the region of interest. Listener Reference Point (LRP): A generic term representing the location at which
49、the acoustic output from the receiver is to be determined or specified. For the purposes of this standard, the LRP of a speakerphone is the FF. Mouth Reference Point (MRP): A point on the axis of the mouth simulator, 25 mm in front of the center of the equivalent lip plane. Nom VC 0 km (Nominal Volume Control Setting 0 km): The quietest volume control setting that produces a receive level of at least 65 dBSPL with a speech test level of -18 dBV with a 0 km artificial line. Nom VC 2.7 km (Nominal Volume Control Setting 2.7 km): The quietest volume control setting that produc
