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This paper presents a smart window system which can transmit only necessary sound as siren of ambulance, but blocks any other unnecessary noises and disturbances in the primary path, by controlling the second window's vibration by piezoelectric actuators using information of the first window's vibration sensed by piezoelectric sensors. For the purpose, we propose the adaptive necessary signal extraction...
A virtual error approach is proposed to attain direct adaptive active sound control using multiple microphones and loudspeakers, when the second path dynamics (room transfer matrix) is uncertain and changeable. To reduce the control errors, two kinds of virtual error vectors are introduced and are forced into zero by adjusting two or three adaptive FIR filter matrices in an on-line manner, by which...
A new direct adaptive approach is proposed for general multichannel active noise control (ANC) when all of the sound path dynamics are uncertain and changeable. To reduce the canceling errors, two kinds of virtual errors are introduced and are forced into zero by adjusting three adaptive FIR matrix filters in an on-line manner, by which the convergence of the actual canceling errors to zero can be...
The adaptive active noise control problem of a multichannel system is studied. The general structure of the multichannel active noise control system is clarified and the perfect cancellation condition by feedforward control is analyzed. A new LMS type of robust multichannel adaptive algorithm for updating the feedforward controllers is proposed which can assure the stability of the adaptation and...
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