Earphone characteristic measuring device

Details Earphone characteristic measuring device Earphone characteristic measuring device

1984-02-02

1986-04-29

Isen, Forester W.

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

Testing of hearing aids

73585, H04R 2900

Patent

active

045861943

ABSTRACT:
An earphone characteristic measuring device comprises an acoustic coupler having an acoustic tube simulated to an external auditory canal in which an earphone under measurement is to be inserted and an acoustic tube of a smaller diameter having an acoustic impedance of approximately 320 ohms connected to an end of the first acoustic tube, a sound source for emitting an impulse sound to the acoustic coupler, a microphone mounted at the end of the first acoustic tube for picking up sound pressure information and a characteristic calculation circuit for transforming an earphone characteristic of the acoustic coupler to an earphone characteristic of a real ear based on an input impedance of the acoustic coupler viewed from an end of the earphone inserted in the acoustic coupler and an input impedance of the real ear represented by a sum of an eardrum impedance of the real ear and an external auditory canal volume of the real ear, stored in a memory in response to the sound pressure information from the microphone. The use of the acoustic coupler of a simple structure facilitates the measurement of a vent characteristic of the earphone and an insertion gain and improves reliability of the measurement.

REFERENCES:
patent: 4079198 (1978-03-01), Bennett
patent: 4251686 (1981-02-01), Sokolich
patent: 4289143 (1981-09-01), Canavesio et al.
patent: 4425481 (1984-01-01), Mansgold et al.
patent: 4459996 (1984-07-01), Teele
patent: 4471171 (1984-09-01), Kopke et al.
"Head and Torso Simulator with Simplified Artificial Ear and Its Application to Simulated in Situ Measurement of Hearing Aid," 11th International Congress of Acoustics in Paris, 1983.

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