ACTIVE NOISE CONTROLLER FOR AUTOMATICALLY ADJUSTING GAIN

Japanese Patent JP3548293

B2

PROBLEM TO BE SOLVED: To properly adjust a gain by simple constitution by controlling a gain control part so that the gains of a noise signal amplifying part and an error signal amplifying part are made to be almost the same by means of a second sound source.
SOLUTION: An output value Ej of a noise signal amplifying part 9 is preserved by a primary sound source 2. By stopping the primary sound source 2, driving a secondary sound source 11 and adjusting the gain of a noise erasing signal amplifying part 8 and a frequency spectrum adjusting part 11', the output Gj of the amplifying part 8 is made to be equalized to Ej. The output value Gj obtained by being thus adjusted is preserved. While preserving the output value Ej as it is, the gain of an error signal amplifying part 9 is adjusted, readjustment is performed so that the output of the amplifying part 9 equals to the preserved Gj. While preserving the output value Gi as it is, the gain of a noise detecting signal amplifying part 6 is adjusted so that the output Xj of the noise detecting signal amplifying part 6 equals to the preserved Gj. Consequently, stable and optimum noise control is performed.

Tadashi Ohashi
Tsutomu Hoshino

JP22528595A

July 28, 2004

September 01, 1995

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富士通株式会社

F01N1/00; G05B13/02; G10K11/16; G10K11/178; H03H17/00; H03H21/00; (IPC1-7): G10K11/178; F01N1/00; G05B13/02; G10K11/16; H03H17/00; H03H21/00

JP5073070A
JP5265468A
JP5088685A
JP6059689A
JP7028478A
JP6012088A
JP63148709A
JP5080781A
JP5127683A
JP6222779A
JP63253759A
JP2127823A
JP2146852A

Fukui Kunibashi
Fumihiro Hasegawa
Yutaka Morita
Yoshiyoshi Ogasawara

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