Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1985-03-05
1987-01-13
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
G10K 1116
Patent
active
046370480
ABSTRACT:
Some degree of cancellation of noise from an annular noise source can be achieved by using an annular noise generator surrounding the source and in antiphase therewith. However due to the dimensions of the annulus, constructive interference may occur at frequencies of interest. In the present invention an annular noise source is surrounded by inner and outer annular noise generators generating sounds which are in antiphase and in phase respectively with sounds from the noise source. Also sounds from the inner generator are of twice the amplitude of those from the source and the outer generator. In effect over a considerable frequency range, the noise source and the outer generator have a mean position which coincides with the inner generator and together they generate sounds which are of the same amplitude but opposite phase to sounds from the generator. Thus destructive interference occurs in the said frequency range. The invention may also be applied to two spaced apart noise sources or arrangements of sources which can be regarded as annular or as two spaced sources.
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patent: 4044203 (1977-08-01), Swinbanks
patent: 4153815 (1979-05-01), Chaplin
patent: 4527282 (1985-07-01), Chaplin
"An Algorithm for Dressing a Broadband Active Sound Control System", Journal of Sound and Vibration, (1982) 80(3), 373-380, C. F. Ross.
"The Ambiguity of Acoustic Sources--A Possibility for Active Control?", Journal of Sound and Vibration (1976) 48(4), 475-483, A. J. Kempton.
National Research Development Corp.
Rubinson Gene Z.
Schroeder L. C.
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