Headphones

Details Headphones Headphones

1990-05-29

1992-03-24

Isen, Forester W.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Plural or compound reproducers

381187, 379430, H04R 2500, H04M 100

Patent

active

050995197

ABSTRACT:
A headphone having two earpieces, one of which contains a speaker, and the other of which contains a microphone. The person wearing the headphone can speak in a normal manner and have the microphone pick up his words. Sound waves are transmitted from the person's vocal cords through his throat and eustachian tube into his eardrum. The sound waves are passed along the ear canal into the microphone. A person wearing the headphone can both listen and speak, while having his hands completely free to perform associated tasks, e.g. taking notes, operating a typewriter, etc. A fold-up version can be converted to a regular telephone handset instantly.

REFERENCES:
patent: 3306991 (1967-02-01), Wood
patent: 3551607 (1970-12-01), Tommasi
patent: 3971900 (1976-07-01), Foley
patent: 4087653 (1978-05-01), Frieder, Jr. et al.
patent: 4088849 (1978-05-01), Usami et al.
patent: 4138598 (1979-02-01), Cech
patent: 4420657 (1983-12-01), Larkin
patent: 4484029 (1984-11-01), Kenney
patent: 4821318 (1989-04-01), Wu
patent: 4882745 (1989-11-01), Silver
patent: 4907266 (1990-03-01), Chen

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