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SJ/Z 9144-1987IEC reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts (English PDF)

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Issued by

Ministry of Industry and Information Technology

Level / Type

National · Recommended

Issue date

January 1, 1987

Implementation date

January 6, 1988

Scope

SJ/Z 9144-1987 (IEC reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts) is available as an English-translated PDF.

SJ/Z 9144-1987 is the Chinese standard "IEC reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts".

The purpose of this Recommendation is to draw the one with a specific sound headphones Holds disrupt the coupling cavity, it can be in the frequency range 200 ~ 5000Hz, the determination of the physical properties of air conduction hearing aids headset, the headset is by ear as ear molds or similar devices coupled to the human ear.

Coupled cavity is earlier than 2cm ^ 3 coupling cavity development. With this coupling cavity does not give the actual performance of the hearing aid in each person obtained.

However, IEC recommend it as an easy way to exchange data and physical characteristics of the hearing aid.

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Document preview — SJ/Z 9144-1987

National Standard of the People's Republic of China

Classification: L31

Document data

1 Document data

Sector: Electronics Industry Standard.

Date of implementation: 1/6/1988.

Chinese Standard Classification: L31.

Length: about 5,542 characters in the Chinese original.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.

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