ANSI ASA S3.7-2016 pdf free download – Method for Measurement and Calibration of Earphones.
The electroacoustic test methods described in this standard are primarily for use with circumaural (over- the-ear), supra-aural (against-the-ear) and insert (ear-canal) type earphones, but may be applied to other types as well. Although these methods are generally applicable to earphones for all uses, the most common application of these methods are for earphones intended for hearing aids and audiometric testing and for receivers or other electroacoustic transducers intended for use in an earphone. In all cases, connection to the device under test is analog electrical; Digital, USB, or wireless systems are not considered. For additional requirements and tests for earphones for consumer audio applications, reference is made to IEC 60268-7.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ANSI/ASA S1.6-2016 American National Standard Preferred Frequencies and Filter Band Center Frequencies for Acoustical Measurements
ANSI/ASA S3.6 American National Standard Specifications for Audiometers
ANSI/ASA S3.20 American National Standard Bioacoustical Terminology
ANSI/ASA S3.22 American National Standard Specification of Hearing Aid Characteristics
ANSI/ASA S3.25-2009 American National Standard for an Occluded Ear Simulator
ANSI/ASA S3.36-2012 American National Standard Specification for a Manikin for in-situ Airborne Acoustic Measurements
ANSI/ASA S3.55/Part 1/IEC 60318-1 American National Standard Electroacoustics – Simulators of Human Head and Ear – Part 1: Ear Simulator for the Measurement of Supra-aural and Circumaural Earphones (a nationally adopted international standard)
ANSI/ASA S3.55/Part 3/IEC 60318-3 American National Standard Electroacoustics – Simulators of Human Head and Ear – Part 3: Acoustic Coupler for the Calibration of Supra-aural Earphones Used in Audiometry (a nationally adopted international standard)
ANSI/ASA S3.55/Part 5/IEC 60318-5 MOD American National Standard 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 (a modified nationally adopted international standard)
IEC 60263:1982 Scales and sizes for plotting frequency characteristics and polar diagrams
IEC 60268-5:2003 Sound system equipment – Part 5: Loudspeakers
IEC 60268-7:2010 Sound system equipment – Part 7: Headphones and earphones
IEC 61094-4 Measurement microphones – Part 4: Specifications for working standard microphones
IEC/TS 62886:2016 Hearing aids – Method for measuring electroacoustic performance up to 16 kHz
ITU-T Recommendation P. 57, Artificial Ears, International Telecommunications Union, Geneva,Switzerland
ITU-T Recommendation P. 58, Head and Torso Simulator, International Telecommunications Union, Geneva, Switzerland
ISO 3:1973 Preferred numbers – Series of preferred numbers
ISO/IEC Guide 98-3 Uncertainty of measurement – Part 3: Guide to the expression of uncertainty in measurement (GUM)
3 Terms and definitions
For the purpose of this document, the following definitions apply:
3.1 coupler.
Cavity of specified shape and volume, in conjunction with a calibrated microphone adapted to measure the sound pressure developed in the cavity, used for the measurement and calibration of earphones.
NOTE Couplers for earphone and receiver measurements are specified in ANSI/ASA S3.55-2014/Part 1/IEC 60318-1:2009, ANSI/ASA S3.55-2015/Part 3/IEC 60318-3:2014, and ANSI/ASA S3.55-2014/Part 5/IEC 60318-5:2006.
3.2 circumaural earphone.
Earphone which encloses the pinna and rests on the surrounding surface of the head.
NOTE Contact with the head is normally maintained by compliant cushions. Circumaural earphones may touch but should not significantly compress the pinna.
3.3 earphone.
An electroacoustic system, including the transducer and housing, intended to be closely coupled to the ear.
3.4 ear simulator/occluded ear simulator.
Device which approximates the acoustic transfer impedance of the inner part of the human ear canal, from
the tip of an earmold to the eardrum.
NOTE Occluded ear simulators are specified in ANSI/ASA S3.25-2012.
3.5 input-output characteristic.
A single frequency plot of the earphone output level on the ordinate as a function of input level on the
abscissa, with equal decibel scale divisions on each axis.
3.6 insert earphone.
An earphone coupled by a tube and/or earmold with the output tip inside the ear canal.
3.7 intra-concha earphone.
Earphone designed to rest in the concha.ANSI ASA S3.7 pdf download.