Hearing aid, especially of the in-the-ear type

Details Hearing aid, especially of the in-the-ear type Hearing aid, especially of the in-the-ear type

1990-09-04

1991-07-16

Isen, Forester W.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 686, 381 93, H04R 2500

Patent

active

050330900

ABSTRACT:
In a hearing aid with a microphone, an amplifier and a receiver supplying amplified sound to the user, a second signal path is provided comprising a second, feedback-suppressing microphone, placed at a location to receive feedback-causing sound from the receiver. The output of second provided microphone is suitably attenuated and delayed by an amount .DELTA.t corresponding to the effective acoustical distance a+b between the second microphone and the main microphone and supplied to a difference amplifier in opposition to the signal from the main microphone. Thus, the component of the signal from the main microphone likely to cause positive feedback or "howling" is substantially cancelled out. In another embodiment, the feedback-suppressing signal path is an acoustical path comprising a tube leading to a rear cavity in a microphone of the directional or differential type.

REFERENCES:
patent: 3763333 (1981-09-01), Lichowsky
patent: 4291203 (1973-10-01), Bellafiore
patent: 4455675 (1984-06-01), Bose et al.
patent: 4456795 (1984-06-01), Saito
patent: 4731850 (1988-03-01), Levitt et al.
patent: 4837829 (1989-06-01), Lobb

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