Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1993-07-29
1994-12-27
Kuntz, Curtis
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
181206, A61F 1106, H03B 2900, F01N 106
Patent
active
053772750
ABSTRACT:
An active noise control apparatus comprises a secondary sound source for generating sound canceling noise emitted from a noise source, first and second microphones sequentially arranged between the noise source and the secondary sound source at a predetermined distance in a direction from the noise source to the secondary sound source, a coefficient multiplier for multiplying an output signal of the second microphone by a coefficient corresponding to a ratio of a transfer function of the first microphone with respect to the secondary sound source to that of the second microphone with respect thereto, a subtracter for obtaining a difference between a multiplication resultant signal and an output signal of the first microphone, and a signal processor for outputting a secondary sound signal obtained by multiplying the difference signal with a predetermined coefficient to the secondary sound source.
REFERENCES:
patent: 4171465 (1979-10-01), Swinbanks
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4669122 (1987-05-01), Swinbanks
patent: 4677676 (1987-06-01), Erickkson
patent: 5119427 (1992-06-01), Hersh et al.
"The Active Control Of Sound Propagation In Long Ducts" M. A. Swinbanks Journal Of Sound and/Vibration (1973)27(3), pp. 411-436.
"Active Control Of Noise Radiated From Duct End" Masaharu Nishimura and Takanori Arai Japan Acoustical Society Journal (Nihon Onkyogakkai-shi) vol. 45, No. 9 (1989).
"Summary translated to English".
Kabushiki Kaisha Toshiba
Kuntz Curtis
Lee Ping W.
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