Active noise attenuating device of the adaptive control type

Details Active noise attenuating device of the adaptive control type Active noise attenuating device of the adaptive control type

1994-03-17

1996-05-14

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, A61F 1106, H03B 2900, H04B 1500

Patent

active

055175716

ABSTRACT:
An active noise attenuating device includes a first microphone located in a propagation path of noise, a loud speaker located downstream from the first microphone, a second microphone located downstream from the loud speaker for receiving sound, and an operational unit for executing an operation on the basis of a detection signal from the first microphone to generate a control signal supplied to the loud speaker so that a sound interfering with the noise is produced. An operational factor of the operational unit is controlled by an adaptive controller on the basis of the detection signal from the second microphone so that an amount of noise attenuated by the sound produced from the loud speaker is rendered maximum. A transfer characteristic of a transfer path between the loud speaker and the second microphone is identified on the basis of the detection signals generated by the second microphone when a sound represented by a periodical identifying signal is produced in a plurality of periods. An operational factor of the adaptive controller is adjusted by an adaptive control identifying unit on the basis of the identified transfer characteristic.

REFERENCES:
patent: 4596033 (1986-06-01), Swinbanks
patent: 5018202 (1991-05-01), Takahash et al.
patent: 5192918 (1993-03-01), Sugiyama
patent: 5278913 (1994-01-01), Dolfosse et al.
patent: 5293578 (1994-03-01), Nagami et al.
patent: 5319715 (1994-06-01), Nagami et al.
patent: 5404409 (1995-04-01), Nagami et al.

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