Noise reducing device

Details Noise reducing device Noise reducing device

1992-06-03

1994-03-08

Dwyer, James L.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 731, A61F 1106, H04R 302

Patent

active

052935787

ABSTRACT:
A noise reducing device including a noise silencing device having a delay unit for delaying a phase of the noise wave, an amplifying unit for adjusting a gain of the delayed noise wave, a superposing unit for superposing the delayed noise wave as the noise silencing wave, a frequency selecting unit for selecting at least one frequency with respect to the noise wave, a factor selecting unit for selecting at least one of a delaying factor used for the delaying unit and a gain factor used for the amplifying unit with respect to the selected frequency, and a controlling unit for controlling at least one of the delaying unit and amplifying unit utilizing the selected delaying factor and a gain factor, respectively, whereby a noise silencing wave having the same frequency and amplitude as that of a noise to reduced but having a reverse phase can be easily obtained, and thus efficient noise reduction can be obtained despite variation of the frequency of the noise.

REFERENCES:
patent: 4087633 (1978-05-01), Fitzwilliam
patent: 4185168 (1980-01-01), Granpe
patent: 4689821 (1987-08-01), Salikaddin
patent: 4947434 (1990-08-01), Ito
patent: 4947435 (1990-08-01), Taylor
patent: 5018202 (1991-05-01), Takahashi et al.
IBM Technical Disclosure Bulletin Audible Noise Suppression Jan. 1989.

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