Headphone with sound pressure sensing means

Details Headphone with sound pressure sensing means Headphone with sound pressure sensing means

1985-06-27

1987-02-17

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Headphone circuits

381 95, 381158, 381187, 381183, H04R 110, H04M 105, H04M 300

Patent

active

046445811

ABSTRACT:
Headphones have a small cavity between the diaphragm and the ear canal with a microphone in the cavity closely adjacent to the diaphragm slightly off the axis of the ear canal and headphone diaphragm with the microphone membrane perpendicular to the headphone diaphragm. The microphone provides a feedback signal that is combined with the input electrical signal to be reproduced by the headphones to provide a combined signal that is power amplified for driving the diaphragm. The headphone transducer has a small 23 mm diameter diaphragm with a maximum excursion of 0.6 mm peak-to-peak and a low frequency resonance of 200 Hz. A disk of intracavity damping material inside the cavity isolates the microphone from the ear canal.

REFERENCES:
patent: 2972018 (1961-02-01), Hawley et al.
patent: 3821473 (1974-06-01), Mullins
patent: 4087653 (1978-05-01), Frieder, Jr. et al.
patent: 4455675 (1984-06-01), Bose et al.
patent: 4598417 (1986-07-01), Deno

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