Assistive listening device

Details Assistive listening device Assistive listening device

1991-02-19

1992-10-27

Dwyer, James L.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 69, 381 692, 381 68, H04R 2500

Patent

active

051596393

ABSTRACT:
An assistive listening device detachably securable to a temple frame of eyeglasses. A carrier engages the frame and has one or more clips to which the instrument housing attaches. The housing contains a speaker, microphone and amplifier circuitry. The power supply comprises a battery pack accessible through a door in the housing. The device is turned "on" and "off" by a closing or opening of the door. A sound conducting tube carries sound from the speaker to the ear of the wearer.

REFERENCES:
patent: 2856466 (1958-10-01), Gustafson et al.
patent: 3244819 (1966-04-01), Sapara et al.
patent: 3588384 (1971-06-01), Negley
patent: 3871372 (1975-03-01), Bivins
patent: 4471490 (1984-09-01), Bellafiore
patent: 4712244 (1987-12-01), Zwicker et al.
patent: 4888805 (1989-12-01), Karppala, Jr.

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