Title:
NOISE CANCELLATION DEVICE AND NOISE CANCELLATION PROGRAM
Document Type and Number:
WIPO Patent Application WO/2010/079526
Kind Code:
A1
Abstract:
A directivity control section (10) calculates a main beam signal the directivity of which is directed toward the direction of an object sound and a side beam signal the blind spot of which is directed toward the direction of the object sound from the output signals of a plurality of microphones (2, 3) by signal processing, which a frequency analyzing section (20) converts into spectrums. A sound source discriminating section (30) discriminates whether the sound source is a sound, a stationary noise, or a non-stationary noise from the spectrums of the main beam signal and the side beam signal to output the result of the discrimination of the sound source and calculates the average spectrum which is the statistic of a noise with respect to the main beam signal. A disturbance sound cancelling section (50) subtracts the average spectrum from the spectrum of the main beam signal to cancel the disturbance sound.
Inventors:
NARITA, Tomohiro (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 10083, JP)
Application Number:
JP2009/000011
Publication Date:
July 15, 2010
Filing Date:
January 06, 2009
Export Citation:
Assignee:
Mitsubishi Electric Corporation (7-3 Marunouchi 2-chome, Chiyoda-ku Tokyo, 10, 10083, JP)
三菱電機株式会社 (〒10 東京都千代田区丸の内二丁目７番３号 Tokyo, 10083, JP)
三菱電機株式会社 (〒10 東京都千代田区丸の内二丁目７番３号 Tokyo, 10083, JP)
International Classes:
G10L15/20; G10L21/02; H04R1/40; H04R3/00
Attorney, Agent or Firm:
TAZAWA, Hideaki et al. (Akasaka Sanno Center Bldg, 12-4 Nagata-cho 2-chom, Chiyoda-ku Tokyo 14, 10000, JP)
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