METHOD AND APPARATUS FOR REDUCING REPETITIVE NOISE ENTERING THE EAR

PCT No. PCT/GB82/00176 Sec. 371 Date Feb. 9, 1983 Sec. 102(e) Date Feb. 9, 1983 PCT Filed Jun. 11, 1982 PCT Pub. No. WO82/04479 PCT Pub. Date Dec. 23, 1982.Apparatus for improving the audibility of incident sound (4) to a person (3) operating in an environment where there is a substantial background...

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Hauptverfasser:	TERRENCE PATRICK CONWAY BRAMER, RODERICK ALAN SMITH, GEORGE BRIAN BARRIE CHAPLIN
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR BANDAGES, DRESSINGS OR ABSORBENT PADS DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION HUMAN NECESSITIES HYGIENE MEASURING MEASURING QUANTITY OF HEAT MEASURING TEMPERATURE MEDICAL OR VETERINARY SCIENCE METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PHYSICS PROSTHESES SOUND-PRODUCING DEVICES TESTING THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR TREATMENT OR PROTECTION OF EYES OR EARS
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Zusammenfassung:	PCT No. PCT/GB82/00176 Sec. 371 Date Feb. 9, 1983 Sec. 102(e) Date Feb. 9, 1983 PCT Filed Jun. 11, 1982 PCT Pub. No. WO82/04479 PCT Pub. Date Dec. 23, 1982.Apparatus for improving the audibility of incident sound (4) to a person (3) operating in an environment where there is a substantial background noise field (2) coming from a source (1) of repetitive noise, comprises an adaptable waveform generator (7), a first electro-acoustic transducer (10) receiving a synthesized cancelling waveform from the generator (7) and generating a cancelling noise to at least partly null the background noise, a second electro-acoustic transducer (11) to sense the partially nulled background noise, and adaptor (13) to modify the output of the generator (7) on the basis of the electrical output signal from the second transducer to minimize the nulled background noise, and sensor (5) to feed a triggering signal (6) derived from the source to the waveform generator. The electro-acoustic transducers (10, 11) can be mounted in headset (8) holding the transducers adjacent to an ear of said person without substantially impeding the arrival of said incident sound (4) to said ear.