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DEFSTAN 00-25(PT9)/1(1991) : 1991

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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Preface
Section One. General
0 Introduction
1 Scope
2 Related Documents
3 Definitions
Section Two. Hearing Characteristics
4 The Auditory Communication Window
Section Three. Speech Characteristics
5 Speech Sounds, Their Spectra, Dynamics and Levels
Section Four. Speech Communication and its Assessment
6 Categories of Communication
7 Unamplified Speech
8 Amplified or Electronically-Assisted Speech
9 Vocoded or Synthetic Speech
10 Intelligibility Testing
Section Five. Techniques and Hardware for Improved Communication
11 General
Section Six. Voice Procedure
12 Reasons for Voice Procedure
13 Voice Procedure
Annex A Design Checklist
Annex B List of Related Documents
Annex C Minimum Performance Requirements
Index

Describes basic characteristics of hearing, speech and the mechanisms whereby people produce and perceive speech, electronically assisted speech and how to predict, measure and assess speech intelligibility in a given noise environment.

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DEFSTAN 00-25(PT1)/2(1987) : 1987 HUMAN FACTORS FOR DESIGNERS OF EQUIPMENT - PART 1: INTRODUCTION
DEFSTAN 00-25(PT7)/2(1996) : 1996 HUMAN FACTORS FOR DESIGNERS OF EQUIPMENT - PART 7: VISUAL DISPLAYS
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ISO/TR 3352:1974 Acoustics — Assessment of noise with respect to its effect on the intelligibility of speech
BS 6259:1982 Code of practice for planning and installation of sound systems
BS 5108:1983 Method for measurement of sound attenuation of hearing protectors
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ANSI/ASA S3.20 : 2015 American National Standard Bioacoustical Terminology
BS 5428-9:1981 Methods for specifying and measuring the characteristics of sound system equipment Programme level meters
ANSI C 16.5 : 54(R1961) VOLUME MEASUREMENTS OF ELECTRICAL SPEECH AND PROGRAM WAVES
BS 5775-2:1979 Specification for quantities, units and symbols Periodic and related phenomena
ISO 1683:2015 Acoustics — Preferred reference values for acoustical and vibratory levels
BS 2475:1964 Specification for octave and one-third octave band-pass filters
BS 5775-7:1979 Specification for quantities, units and symbols Acoustics
BS 6698(1986) : AMD 8236 SPECIFICATION FOR INTEGRATING AVERAGING SOUND LEVEL METERS
ANSI S3.14 : 0 RATING NOISE WITH RESPECT TO SPEECH INTERFERENCE
BS 4727-3:GRP08(1985) : 1985 GLOSSARY OF ELECTROTECHNICAL POWER TELECOMMUNICATION ELECTRONICS LIGHTING & COLOUR TERMS - TERMS PARTICULAR TO TELECOMMUNICATIONS & ELECTRONICS - ACOUSTICS & ELECTROACOUSTICS TERMINOLOGY
BS 5969:1981 Specification for sound level meters
BS 4669:1971 Specification for an artificial ear of the wide band type for the calibration of earphones used in audiometry

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