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  • IEC 61094-1:2000

    Current The latest, up-to-date edition.

    Measurement microphones - Part 1: Specifications for laboratory standard microphones

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Language(s):  English - French, Spanish, Castilian

    Published date:  21-07-2000

    Publisher:  International Electrotechnical Committee

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    Abstract - (Show below) - (Hide below)

    Specifies mechanical dimensions and certain electroacoustic characteristics for condenser microphones used as laboratory standards for the realization of the unit of sound pressure and for sound pressure measurements of the highest attainable accuracy. The specifications are intended to ensure that primary calibration by the reciprocity method can be readily carried out. Establishes a system for classifying laboratory standard condenser microphones into a number of types according to their dimensions and properties.

    General Product Information - (Show below) - (Hide below)

    Committee TC 29
    Development Note Also numbered as BS EN 61094-1 (03/2001) Stability Date: 2019. (09/2017)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Current
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    BS EN 60318-3:2015 Electroacoustics. Simulators of human head and ear Acoustic coupler for the calibration of supra-aural earphones used in audiometry
    BS EN 61094-4:1996 Specification for measurement microphones Specifications for working standard microphones
    ISA 37.16.01 : 2002 A GUIDE FOR THE DYNAMIC CALIBRATION OF PRESSURE TRANSDUCERS
    CEI EN 60942 : 2004 ELECTROACOUSTICS SOUND CALIBRATORS
    CEI EN 61094-3 : 1997 ELECTROACOUSTICS - MEASUREMENT MICROPHONES - PART 3: PRIMARY METHOD FOR FREE-FIELD CALIBRATION OF LABORATORY STANDARD MICROPHONES BY THE RECIPROCITY TECHNIQUE
    15/30326444 DC : 0 BS EN 60942 - ELECTROACOUSTICS - SOUND CALIBRATORS
    BS EN 60318-5:2006 Electroacoustics. Simulators of human head and ear 2 cm3 coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts
    ANSI/ASA S3.55 PART 5:2014 Electroacoustics – Simulators of Human Head and Ear – Part 5: 2 cm3 Coupler for the Measurement of Hearing Aids and Earphones Coupled to the Ear by Means of Ear Inserts (a modified nationally adopted international standard)
    IEC 60942 REDLINE : 4ED 2017 ELECTROACOUSTICS - SOUND CALIBRATORS
    I.S. EN 61183:1995 ELECTROACOUSTICS - RANDOM-INCIDENCE AND DIFFUSE-FIELD CALIBRATION OF SOUND LEVEL METERS
    BS EN 61672-2 : 2013 ELECTROACOUSTICS - SOUND LEVEL METERS - PART 2: PATTERN EVALUATION TESTS
    CEI EN 61672-2 : 2014 ELECTROACOUSTICS - SOUND LEVEL METERS - PART 2: PATTERN EVALUATION TESTS
    ANSI/ASA S1.15 PART 2 : 2005(R2015) MEASUREMENT MICROPHONES - PART 2: PRIMARY METHOD FOR PRESSURE CALIBRATION OF LABORATORY STANDARD MICROPHONES BY THE RECIPROCITY TECHNIQUE
    CEI EN 60318-1 : 2011 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 1: EAR SIMULATOR FOR THE MEASUREMENT OF SUPRA-AURAL AND CIRCUMAURAL EARPHONES
    ANSI/ASA S1.4 PART 2 : 2014 ELECTROACOUSTICS - SOUND LEVEL METERS - PART 2: PATTERN EVALUATION TESTS
    IEC 60318-5:2006 Electroacoustics - Simulators of human head and ear - Part 5: 2 cm3 coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts
    UNE-EN 61094-2:2011 Electroacoustics - Measurement microphones -- Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique
    UNE-EN 61094-3:2017 Electroacoustics - Measurement microphones - Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique
    BS EN ISO 11904-1:2002 Acoustics. Determination of sound immission from sound sources placed close to the ear. Technique using a microphone in a real ear (MIRE technique)
    IEC 61094-4:1995 Measurement microphones - Part 4: Specifications for working standard microphones
    EN 61094-2:2009 Electroacoustics - Measurement microphones - Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique
    EN 61329:1996 Sound system equipment - Methods of measuring and specifying the performance of sounders (electroacoustic transducers for tone production)
    EN 61094-5:2016 Electroacoustics - Measurement microphones - Part 5: Methods for pressure calibration of working standard microphones by comparison
    EN 62585 : 2012 ELECTROACOUSTICS - METHODS TO DETERMINE CORRECTIONS TO OBTAIN THE FREE-FIELD RESPONSE OF A SOUND LEVEL METER (IEC 62585:2012)
    EN 61094-4:1995 Measurement microphones - Part 4: Specifications for working standard microphones
    EN 61094-6:2005 Measurement microphones - Part 6: Electrostatic actuators for determination of frequency response
    EN 61094-8:2012/AC:2013 Measurement microphones — Part 8: Methods for determining the free-field sensitivity of working standard microphones by comparison
    EN 60318-5 : 2006 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 5: 2 CM[3] COUPLER FOR THE MEASUREMENT OF HEARING AIDS AND EARPHONES COUPLED TO THE EAR BY MEANS OF EAR INSERTS
    EN 61183 : 1994 Electroacoustics - Random-incidence and diffuse-field calibration of sound level meters
    BS EN 60942:2003 Electroacoustics. Sound calibrators
    DD IEC/TS 61094-7:2006 Measurement microphones Values for the difference between free-field and pressure sensitivity levels of laboratory standard microphones
    BS EN 61094-6:2005 Measurement microphones Electrostatic actuators for determination of frequency response
    AES 26 : 2001(R2011)
    I.S. EN 61842:2002 MICROPHONES AND EARPHONES FOR SPEECH COMMUNICATIONS
    I.S. EN 60942:2003 ELECTROACOUSTICS - SOUND CALIBRATORS
    I.S. EN 60318-2:1999 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 2: AN INTERIM ACOUSTIC COUPLER FOR THE CALIBRATION OF AUDIOMETRIC EARPHONES IN THE EXTENDED HIGH-FREQUENCY RANGE
    I.S. EN 62585:2012 ELECTROACOUSTICS - METHODS TO DETERMINE CORRECTIONS TO OBTAIN THE FREE-FIELD RESPONSE OF A SOUND LEVEL METER (IEC 62585:2012 (EQV))
    I.S. EN 60318-3:2015 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 3: ACOUSTIC COUPLER FOR THE CALIBRATION OF SUPRA-AURAL EARPHONES USED IN AUDIOMETRY
    BS EN 60318-1:2009 Electroacoustics. Simulators of human head and ear Ear simulator for the measurement of supra-aural and circumaural earphones
    CEI EN 60318-5 : 2007 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 5: 2 CM[3] COUPLER FOR THE MEASUREMENT OF HEARING AIDS AND EARPHONES COUPLED TO THE EAR BY MEANS OF EAR INSERTS
    DIN EN ISO 389-6 E : 2007 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 6: REFERENCE THRESHOLD OF HEARING FOR TEST SIGNALS OF SHORT DURATION
    UNE-EN 61094-5:2017 Electroacoustics - Measurement microphones - Part 5: Methods for pressure calibration of working standard microphones by comparison
    ISO 389-6:2007 Acoustics Reference zero for the calibration of audiometric equipment Part 6: Reference threshold of hearing for test signals of short duration
    IEC 60318-1:2009 Electroacoustics - Simulators of human head and ear - Part 1: Ear simulator for the measurement of supra-aural and circumaural earphones
    EN 13819-2:2002 Hearing protectors - Testing - Part 2: Acoustic test methods
    I.S. EN ISO 6926:2016 ACOUSTICS - REQUIREMENTS FOR THE PERFORMANCE AND CALIBRATION OF REFERENCE SOUND SOURCES USED FOR THE DETERMINATION OF SOUND POWER LEVELS (ISO 6926:2016)
    I.S. EN 13819-2:2002 HEARING PROTECTORS - TESTING - PART 2: ACOUSTIC TEST METHODS
    IEC 60942:2017 RLV Electroacoustics - Sound calibrators
    EN ISO 6926:2016 Acoustics - Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels (ISO 6926:2016)
    EN 61094-3:2016/AC:2017-01 ELECTROACOUSTICS - MEASUREMENT MICROPHONES - PART 3: PRIMARY METHOD FOR FREE-FIELD CALIBRATION OF LABORATORY STANDARD MICROPHONES BY THE RECIPROCITY TECHNIQUE
    CEI EN 61094-6 : 2005 MEASUREMENT MICROPHONES PART 6: ELECTROSTATIC ACTUATORS FOR DETERMINATION OF FREQUENCY RESPONSE
    IEEE 1451.4 : 2004 A SMART TRANSDUCER INTERFACE FOR SENSORS AND ACTUATORS - MIXED-MODE COMMUNICATION PROTOCOLS AND TRANSDUCER ELECTRONIC DATA SHEET (TEDS) FORMATS
    BS EN 61094-5:2002 Measurement microphones Methods for pressure calibration of working standard microphones by comparison
    03/305077 DC : DRAFT MAR 2003 IEC 61094-6 ED.1 - MEASUREMENT MICROPHONES - PART 6: ELECTROSTATIC ACTUATORS FOR DETERMINATION OF FREQUENCY RESPONSE
    14/30301018 DC : 0 BS EN 61094-5 ED 2.0 - MEASUREMENT MICROPHONES - PART 5: METHODS FOR PRESSURE CALIBRATION OF WORKING STANDARD MICROPHONES BY COMPARISON
    BS EN 61842:2002 Microphones and earphones for speech communications
    BS EN 61094-8:2012 Electroacoustics. Measurement microphones Methods for determining the free-field sensitivity of working standard microphones by comparison
    ASA/ANSI S3.55 PART 1:2014(R2019) ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 1: EAR SIMULATOR FOR THE MEASUREMENT OF SUPRA-AURAL AND CIRCUMAURAL EARPHONES
    BS EN 60318-2:1998 Electroacoustics. Simulators of human head and ear An interim acoustic coupler for the calibration of audiometric earphones in the extended high-frequency range
    09/30211834 DC : 0 BS ISO/IEC IEEE 21451-4 - INFORMATION TECHNOLOGY - SMART TRANSDUCER INTERFACE FOR SENSORS AND ACTUATORS - PART 4: MIXED-MODE COMMUNICATION PROTOCOLS AND TRANSDUCER ELECTRONIC DATA SHEET (TEDS) FORMATS
    BS EN 61094-3:2016 Electroacoustics. Measurement microphones Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique
    CEI EN 61094-4 : 1997 MEASUREMENT MICROPHONES PART 4: SPECIFICATIONS FOR WORKING STANDARD MICROPHONES
    IEEE/ANSI C63.19-2011 REDLINE American National Standard Methods of Measurement of Compatibility between Wireless Communications Devices and Hearing Aids
    I.S. EN 60318-1:2009 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 1: EAR SIMULATOR FOR THE MEASUREMENT OF SUPRA-AURAL AND CIRCUMAURAL EARPHONES
    I.S. EN 61094-2:1994 MEASUREMENT MICROPHONES - PART 2: PRIMARY METHOD FOR PRESSURE CALIBRATION OF LABORATORY STANDARD MICROPHONES BY THE RECIPROCITY TECHNIQUE
    ANSI S1.15-2 : 2005 : R2010 MEASUREMENT MICROPHONES - PART 2: PRIMARY METHOD FOR PRESSURE CALIBRATION OF LABORATORY STANDARD MICROPHONES BY THE RECIPROCITY TECHNIQUE
    IEC TS 61094-7:2006 Measurement microphones - Part 7: Values for the difference between free-field and pressure sensitivity levels of laboratory standard microphones
    IEC 60942:2017 Electroacoustics - Sound calibrators
    I.S. EN 61672-2:2013 ELECTROACOUSTICS - SOUND LEVEL METERS - PART 2: PATTERN EVALUATION TESTS
    DIN EN ISO 6926:2016-08 Acoustics - Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels (ISO 6926:2016)
    ISO 6926:2016 Acoustics Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
    IEC 61329:1995 Sound system equipment - Methods of measuring and specifying the performance of sounders (electroacoustic transducers for tone production)
    IEC 61094-2:2009 Electroacoustics - Measurement microphones - Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique
    IEC 61183:1994 Electroacoustics - Random-incidence and diffuse-field calibration of sound level meters
    UNE-EN ISO 6926:2016 Acoustics - Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels (ISO 6926:2016)
    UNI EN ISO 11904-1 : 2006 ACOUSTICS - DETERMINATION OF SOUND IMMISSION FROM SOUND SOURCES PLACED CLOSE TO THE EAR - PART 1: TECHNIQUE USING A MICROPHONE IN A REAL EAR (MIRE TECHNIQUE)
    06/30145241 DC : DRAFT JAN 2006 IEC 60318-1 - ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 1: EAR SIMULATOR FOR THE CALIBRATION OF SUPRA-AURAL AND CIRCUMAURAL EARPHONES
    CEI EN 61094-8 : 2013 ELECTROACOUSTICS - MEASUREMENT MICROPHONES - PART 8: METHODS FOR FREE-FIELD CALIBRATION OF WORKING STANDARD MICROPHONES BY COMPARISON
    CEI EN 61094-2 : 2014 ELECTROACOUSTICS - MEASUREMENT MICROPHONES PART 2: PRIMARY METHOD FOR THE PRESSURE CALIBRATION OF LABORATORY STANDARD MICROPHONES BY THE RECIPROCITY TECHNIQUE
    11/30255884 DC : 0 BS EN 61094-8 ED.1 - ELECTROACOUSTICS - MEASUREMENT MICROPHONES - PART 8: METHODS FOR FREE-FIELD CALIBRATION OF WORKING STANDARD MICROPHONES BY COMPARISON
    06/30158334 DC : 0 BS EN 61094-2 - ELECTROACOUSTICS - MEASUREMENT MICROPHONES - PART 2: PRIMARY METHOD FOR PRESSURE CALIBRATION OF LABORATORY STANDARD MICROPHONES BY THE RECIPROCITY TECHNIQUE
    BS EN 61094-2:2009 Electroacoustics. Measurement microphones Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique
    CEI EN 61842 : 2002 MICROPHONES AND EARPHONES FOR SPEECH COMMUNICATIONS
    CEI EN 61329 : 1998 SOUND SYSTEM EQUIPMENT METHODS OF MEASURING AND SPECIFYING THE PERFORMANCE OF SOUNDERS (ELECTROACOUSTIC TRANSDUCERS FOR TONE PRODUCTION)
    PD 6545:2005 Intended use of human head and ear simulators-guide
    ANSI S12-5:2006 ACOUSTICS - REQUIREMENTS FOR THE PERFORMANCE AND CALIBRATION OF REFERENCE SOUND SOURCES USED FOR THE DETERMINATION OF SOUND POWER LEVELS
    ANSI S12-5 : 2006 : R2011 ACOUSTICS - REQUIREMENTS FOR THE PERFORMANCE AND CALIBRATION OF REFERENCE SOUND SOURCES USED FOR THE DETERMINATION OF SOUND POWER LEVELS
    I.S. EN 60318-5:2006 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 5: 2 CM[3] COUPLER FOR THE MEASUREMENT OF HEARING AIDS AND EARPHONES COUPLED TO THE EAR BY MEANS OF EAR INSERTS
    ANSI S3.55-1 : 2014 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 1: EAR SIMULATOR FOR THE MEASUREMENT OF SUPRA-AURAL AND CIRCUMAURAL EARPHONES
    IEC 61094-5:2016 Electroacoustics - Measurement microphones - Part 5: Methods for pressure calibration of working standard microphones by comparison
    IEC 61094-3:2016 Electroacoustics - Measurement microphones - Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique
    BS EN 13819-2:2002 Hearing protectors. Testing Acoustic test methods
    ISO 11904-1:2002 Acoustics — Determination of sound immission from sound sources placed close to the ear — Part 1: Technique using a microphone in a real ear (MIRE technique)
    BS EN ISO 6926:2016 Acoustics. Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
    BS EN ISO 389-6:2007 Acoustics. Reference zero for the calibration of audiometric equipment Reference threshold of hearing for test signals of short duration
    IEC 62585:2012 Electroacoustics - Methods to determine corrections to obtain the free-field response of a sound level meter
    IEC 61094-8:2012 Measurement microphones - Part 8: Methods for determining the free-field sensitivity of working standard microphones by comparison
    IEC 61842:2002 Microphones and earphones for speech communications
    IEC 61094-6:2004 Measurement microphones - Part 6: Electrostatic actuators for determination of frequency response
    IEC 60318-3:2014 Electroacoustics - Simulators of human head and ear - Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry
    UNE-EN 60318-1:2010 Electroacoustics - Simulators of human head and ear -- Part 1: Ear simulator for the measurement of supra-aural and circumaural earphones
    IEC 60318-2:1998 Electroacoustics - Simulators of human head and ear - Part 2: An interim acoustic coupler for the calibration of audiometric earphones in the extended high-frequency range
    EN ISO 11904-1 : 2002 ACOUSTICS - DETERMINATION OF SOUND IMMISSION FROM SOUND SOURCES PLACED CLOSE TO THE EAR - PART 1: TECHNIQUE USING A MICROPHONE IN A REAL EAR (MIRE TECHNIQUE)
    EN ISO 389-6 : 2007 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 6: REFERENCE THRESHOLD OF HEARING FOR TEST SIGNALS OF SHORT DURATION
    IEEE DRAFT C63.19 : 2005 METHODS OF MEASUREMENT OF COMPATIBILITY BETWEEN WIRELESS COMMUNICATIONS DEVICES AND HEARING AIDS
    CEI EN 61094-5 : 2002 ELECTROACOUSTICS - MEASUREMENT MICROPHONES - PART 5: METHODS FOR PRESSURE CALIBRATION OF WORKING STANDARD MICROPHONES BY COMPARISON
    EN IEC 60942:2018 Electroacoustics - Sound calibrators
    12/30264191 DC : DRAFT MAY 2012 BS EN 61094-3 - ELECTRO ACOUSTICS - MEASUREMENT MICROPHONES - PART 3: PRIMARY METHOD FOR FREE FIELD CALIBRATION OF LABORATORY STANDARD MICROPHONES BY THE RECIPROCITY TECHNIQUE
    09/30208590 DC : 0 BS EN 61672-2 ED.2 - ELECTROACOUSTICS - SOUND LEVEL METERS - PART 2: PATTERN EVALUATION TESTS
    BS EN 62585:2012 Electroacoustics. Methods to determine corrections to obtain the free-field response of a sound level meter
    CEI EN 62585 : 2013 ELECTROACOUSTICS - METHODS TO DETERMINE CORRECTIONS TO OBTAIN THE FREE-FIELD RESPONSE OF A SOUND LEVEL METER
    UNE-EN 61094-8:2013 Measurement microphones. Part 8: Methods for determining the free-field sensitivity of working standard microphones by comparison
    10/30194376 DC : 0 BS EN 62585 ED.1 - ELECTROACOUSTICS - METHODS TO DETERMINE CORRECTIONS TO OBTAIN FREE-FIELD RESPONSE OF A SOUND LEVEL METER
    UNE-EN 62585:2013 Electroacoustics - Methods to determine corrections to obtain the free-field response of a sound level meter
    I.S. EN IEC 60942:2018 ELECTROACOUSTICS - SOUND CALIBRATORS
    I.S. EN 61094-8:2012 MEASUREMENT MICROPHONES - PART 8: METHODS FOR DETERMINING THE FREE-FIELD SENSITIVITY OF WORKING STANDARD MICROPHONES BY COMPARISON (IEC 61094-8:2012 (EQV))
    I.S. EN 61329:1999 SOUND SYSTEM EQUIPMENT - METHODS OF MEASURING AND SPECIFYING THE PERFORMANCE OF SOUNDERS (ELECTROACOUSTIC TRANSDUCERS FOR TONE PRODUCTION)
    ANSI S1.15-2 : 2005 MEASUREMENT MICROPHONES - PART 2: PRIMARY METHOD FOR PRESSURE CALIBRATION OF LABORATORY STANDARD MICROPHONES BY THE RECIPROCITY TECHNIQUE
    I.S. EN 61094-5:2016 ELECTROACOUSTICS - MEASUREMENT MICROPHONES - PART 5: METHODS FOR PRESSURE CALIBRATION OF WORKING STANDARD MICROPHONES BY COMPARISON
    ANSI/ASA S3.55 PART 3 : 2014 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 3: ACOUSTIC COUPLER FOR THE CALIBRATION OF SUPRA-AURAL EARPHONES USED IN AUDIOMETRY
    I.S. EN 61094-6:2005 MEASUREMENT MICROPHONES - PART 6: ELECTROSTATIC ACTUATORS FOR DETERMINATION OF FREQUENCY RESPONSE
    ISO/IEC/IEEE 21451-4:2010 Information technology — Smart transducer interface for sensors and actuators — Part 4: Mixed-mode communication protocols and Transducer Electronic Data Sheet (TEDS) formats
    I.S. EN 61094-3:2016 ELECTROACOUSTICS - MEASUREMENT MICROPHONES - PART 3: PRIMARY METHOD FOR FREE-FIELD CALIBRATION OF LABORATORY STANDARDMICROPHONES BY THE RECIPROCITY TECHNIQUE
    IEC 61672-2:2013+AMD1:2017 CSV Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests
    DIN EN ISO 389-6:2007-10 Acoustics - Reference zero for the calibration of audiometric equipment - Part 6: Reference threshold of hearing for test signals of short duration (ISO 389-6:2007)
    EN 60318-2:1998 Electroacoustics - Simulators of human head and ear - Part 2: An interim acoustic coupler for the calibration of audiometric earphones in the extended high-frequency range
    EN 60318-3:2015 Electroacoustics - Simulators of human head and ear - Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry
    EN 61672-2:2013/A1:2017 ELECTROACOUSTICS - SOUND LEVEL METERS - PART 2: PATTERN EVALUATION TESTS (IEC 61672-2:2013/A1:2017)
    EN 61842:2002 Microphones and earphones for speech communications
    EN 60318-1:2009 Electroacoustics - Simulators of human head and ear - Part 1: Ear simulator for the measurement of supra-aural and circumaural earphones

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC 60050-801:1994 International Electrotechnical Vocabulary (IEV) - Part 801: Acoustics and electroacoustics
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