Honda Giken Kogyo Kabushiki Kaisha

Alpine Electronics, Inc.

Kunio Miyauchi

Masaichi Akiho

Akira Suto

Nozomu Saito

Tsuyoshi Yamashita

Hisashi Sano

Makoto Namekawa

Tetsu Kanamori

Syunichi Imanishi

Hideki Sato

Tatsuo Owaki

Kenji Imai

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.

Noise-canceling apparatus

A noise-canceling method for simultaneously canceling a plurality of harmonic components of the engine rotational speed contained in engine noise. Reference signals are generated in correspondence with a plurality of harmonic components, and an adaptive signal processing is executed by using each reference signal, a composite-sound signal of the engine sound and a composite noise-canceling sound at a noise-canceling point, thereby generating a noise-canceling signal. The noise-canceling signal is input to a speaker. The reference signal corresponding to a harmonic component of a low level is multiplied by a constant K before it is input to the speaker so as to approximately equalize the levels of all the harmonic components at the noise-canceling point.

Noise canceling method

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Wako, Japan

Kunio Miyauchi