IEEE 269 2003

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IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets

Published By	Publication Date	Number of Pages
IEEE	2003	149

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Description

Revision Standard – Inactive – Superseded. Practical methods for making laboratory measurements of electroacoustic characteristics of analog and digital telephones, handsets, and headsets are provided in this revised standard. The methods may also be applicable to a wide variety of other communications equipment, including cordless, wireless, and mobile communications devices. Measurement results may be used to evaluate these devices on a standardized basis. Application is in the frequency range 1008500 Hz. Revised by amendment IEEE Std 269a-2007.

PDF Catalog

PDF Pages	PDF Title
1	Cover
2	IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets
4	Introduction Participants
6	Contents
16	1. Overview 1.1 Scope
17	1.2 Purpose 1.3 Contents of standard 2. References
19	3. Definitions
22	4. Abbreviations, acronyms, and symbols 4.1 Abbreviations and acronyms
23	4.2 Symbols
24	5. Test equipment and setup 5.1 Ear simulators
25	5.2 Mouth simulators
26	5.3 Test fixtures
30	5.4 Measurement microphones 5.5 Test environment
32	5.6 Acoustic impairments
33	6. Calibration 6.1 General 6.2 Electrical measurement instruments 6.3 Measurement microphones 6.4 Ear simulator 6.5 Measurement bandwidth and resolution 6.6 Electrical test signals
34	6.7 Mouth simulator
36	7. Test procedure for analog sets 7.1 General
37	7.2 Analog DC feed circuits
39	7.3 Analog telephone network impairments
41	7.4 Receive
43	7.5 Send
46	7.6 Sidetone
48	7.7 Overall
49	7.8 Telephone set impedance
50	7.9 Howling 7.10 Maximum acoustic output
51	8. Test procedures for digital and four-wire systems 8.1 General
53	8.2 Digital test circuits
55	8.3 Digital telephone network impairments
57	8.4 Receive
59	8.5 Send
62	8.6 Sidetone
65	8.7 Overall
66	8.8 Echo frequency response
67	8.9 Temporally weighted terminal coupling loss 8.10 Stability loss
68	8.11 Convergence time 8.12 Discontinuous speech transmission
69	8.13 Maximum acoustic output
71	9. Test procedures for analog four-wire handsets and headsets 9.1 General
73	9.2 Handset and headset test circuits
74	9.3 Receive
76	9.4 Send
79	9.5 Echo frequency response
80	9.6 Maximum acoustic output
82	Annex A (normative)—Ear simulators with flexible pinnas and positioning devices A.1 General characteristics of the ear simulators A.2 Differences between the two ear simulators A.3 Handset positioning devices
84	Annex B (normative)—Alternative ear simulators, mouth simulator, and test fixture B.1 Alternative ear simulators
85	B.2 Alternative mouth simulator
86	B.3 Alternative test fixture
87	Annex C (normative)—DRP to ERP and related translations
90	Annex D (normative)—Conditioning for carbon transmitters
91	Annex E (normative)—Hoth room noise
93	Annex F (normative)—Test signals F.1 General F.2 Classifications F.3 Modulation types
94	F.4 Deterministic signals
95	F.5 Random signals
96	F.6 Speech-like signals
97	F.7 Compound signals
100	F.8 Test signal bandwidth F.9 Signal parameter summary F.10 Test signals published on CD-ROM F.11 Signal and test method comparative summary
102	Annex G (normative)—Analyis methods G.1 General G.2 Fast Fourier transform (FFT) and cross-spectrum analysis
103	G.3 Real-time filter analysis (RTA)
104	G.4 Sine-based analysis
105	G.5 Simulated free field techniques G.6 Measurement bandwidth
106	G.7 Measurement resolution
109	Annex H (normative)—Loudness rating calculations
111	Annex I (normative)—Linearity
115	Annex J (normative)—Distortion J.1 Overview J.2 Signal suitability test J.3 Signal-to-distortion-and-noise ratio (SDN)
116	J.4 Sinusoidal methods
118	J.5 Coherence methods (N/C ratio)
120	Annex K (normative)—Send signal-to-noise ration K.1 Send signal-to-noise ratio K.2 Weighted send signal-to-noise ratio
122	Annex L (normative)—Delay L.1 General L.2 Captured pulse method L.3 Two-channel analyzer methods L.4 Time delay spectrometry method
123	L.5 MLS method
124	Annex M (normative)—Sidetone echol
125	Annex N (normative)—Maximum acoustic pressure limits N.1 Abstract N.2 Introduction
127	N.3 Proposal
130	Annex O (normative)—Temporally weighted terminal coupling loss measurement method O.1 General O.2 Initial signal processing O.3 Modeling echo audibility
132	O.4 Expressing TCL results
133	Annex P (normative)—Temporally weighted terminal coupling loss algorith P.1 General P.2 TCLT algorithm
139	Annex Q (normative)—Simulated speech generator (SSG) Q.1 Main signal Q.2 Modulating signal Q.3 Combined signal
140	Q.4 Gaussian signal generator Q.5 Gamma function
141	Annex R (normative)—TDS sweep with P.50 noise bursts
142	Annex S (informative)—Use of the free field as the telephonometric reference point
144	Annex T (informative)—Useful conversion procedures T.1 Conversions for dBV to dBm, and for 600 and 900
145	T.2 Conversions for dBmp to dBrnC for electrical noise measurements T.3 Loudness rating conversions T.4 Acoustic sound pressure conventions
146	Annex U (informative)—Loudness balance subjective test procedure U.1 Introduction U.2 Loudness balance test procedure
147	U.3 Example test circuit
148	U.4 Estimate of test headset receive characteristics
149	Annex V (informative)—Bibliography

Additional information

Standard Title	IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets
Published Code	IEEE
Publication Date	2003
Pages Count	149

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