Honda Giken Kogyo Kabushiki Kaisha

Alpine Electronics, Inc.

Tatsuo Owaki

Nozomu Saito

Masaichi Akiho

Akira Suto

Kunio Miyauchi

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.

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Iwaki, Japan

Tatsuo Owaki