Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1993-06-08
1996-06-04
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
A61F 1106
Patent
active
055240577
ABSTRACT:
A noise-canceling apparatus includes a canceling-sound generating source for outputting a canceling sound, a sensor for sensing a composite sound that is a composite of noise and the canceling sound at a noise-canceling point, a noise-canceling controller, to which a composite-sound signal and a reference signal conforming to noise generated by a noise source are inputted, for generating a noise-canceling signal by executing adaptive signal processing so as to cancel out the noise at the noise-canceling point using these signals and inputting the noise-canceling signal to the canceling-sound generating source, and a frequency-characteristic correcting unit provided on the input side of an adaptive filter, which constructs the noise-canceling controller, and having a frequency characteristic that is substantially symmetrical, about a 0 dB line, with respect to the frequency characteristic of a canceling-sound propagation system. The noise-canceling controller executes adaptive signal processing with a signal obtained by inputting the reference signal to the frequency-characteristic correcting unit being adopted as a true reference signal.
REFERENCES:
patent: 4480333 (1984-10-01), Ross
patent: 4637048 (1987-01-01), Swinbanks
Dorf, Richard C., Modern Control Systems, 1974, Second edition, p. 47.
Akiho Masaichi
Miyauchi Kunio
Owaki Tatsuo
Saito Nozomu
Suto Akira
Alpine Electronics Inc.
Honda Giken Kogyo Kabushiki Kaisha
Isen Forester W.
Lee Ping W.
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