Insert earphones for audiometry

Details Insert earphones for audiometry Insert earphones for audiometry

1984-07-05

1987-06-30

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Headphone circuits

181130, 381103, 381187, 381 686, H04R 110, H04R 128, H04R 2500, H03G 500

Patent

active

046776796

ABSTRACT:
Insert earphones, which are especially useful for audiometry applications include a transducer which is coupled to a resonance cancellation tube as well as to a main tube which is coupled to the ear, with series acoustic dampers in the tubes, operating in a known manner to obtain a smoothly varying frequency response characteristic. An electrical equalization network is coupled to the transducer, cooperating with the acoustic components to obtain a frequency response characteristic which is either flat or which matches that of the human ear. The dampers in series with the main and cancellation tubes have acoustic resistances which are respectively about 20% lower and 20% higher than the characteristic impedances of such tubes, operating to obtain a broadband increase in output.

REFERENCES:
patent: 3811437 (1974-05-01), Gardner, Jr.
patent: 3930560 (1976-01-01), Carlson et al.
patent: 3935398 (1976-01-01), Carlson et al.
patent: 4006321 (1977-02-01), Carlson
Hearing Instruments, "A New Acoustic Horn for Small Ear Canals", E. Robert Libby, vol. 3, No. 9, Sep. 1982, p. 48.

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