Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1992-05-15
1995-06-20
Kuntz, Curtis
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
381 81, A61F 1106
Patent
active
054267030
ABSTRACT:
An active noise eliminating system comprises microphones for detecting residual noise, speakers for generating noise elimination sound for interference with the residual noise, a noise generating condition sensor for generating noise condition, a controller for generating noise elimination signals inputted to the speakers and determined by the detected residual noise signals and the detected noise condition signal in accordance with a control algorithm including transfer functions between the speakers and microphones respectively. The transfer functions are updated on the basis of a test signal generated when noise sound diverges.
REFERENCES:
patent: 4677676 (1987-06-01), Eriksson
patent: 5029218 (1991-07-01), Nagayasu
patent: 5117401 (1992-05-01), Feintuch
patent: 5170433 (1992-12-01), Elliott et al.
Doi Kazuhiro
Hamabe Tsutomu
Kinoshita Akio
Muraoka Kenichiro
Nakaji Yoshiharu
Kuntz Curtis
Lee Ping W.
Nissan Motor Co,. Ltd.
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