Attenuation of sound waves

Details Attenuation of sound waves Attenuation of sound waves

1985-02-21

1986-06-17

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116, H04R 128

Patent

active

045960330

ABSTRACT:
When sound waves are intentionally attenuated by systems using destructive interference temporal changes sometimes cause less than optimum performance. In the present invention the transfer function of a signal processing system connected between a sound detector and a sound generator destructively interfering with an unwanted sound is modified at intervals as a result of sequential measurements of the transfer function between the sound detector and a further sound detector downstream from the generator. For this purpose a data processor calculates the required transfer function and causes a data processor to vary the coefficients of a digital filter comprising the signal processing system.

REFERENCES:
patent: 4109108 (1978-08-01), Coxon
patent: 4122303 (1978-10-01), Chaplin
patent: 4153815 (1979-05-01), Chaplin
patent: 4171465 (1979-10-01), Swinbanks
patent: 4417098 (1983-11-01), Chaplin
patent: 4473906 (1984-09-01), Warnaka
patent: 4480333 (1984-10-01), Ross
patent: 4489441 (1984-12-01), Chaplin

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