Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Counterwave generation control path
Patent
1998-04-15
1999-10-26
Harvey, Minsun Oh
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Counterwave generation control path
381 718, 381 714, A61F 1106, H03B 2900
Patent
active
059741554
ABSTRACT:
A system for actively damping low frequency noise in an enclosure is provided comprising an acoustic wave sensor, and acoustic wave actuator, and an electronic feedback loop. The acoustic wave actuator is substantially collocated with the acoustic wave sensor within an enclosure. The electronic feedback loop is operative to generate a signal at its output by applying a feedback loop transfer function. The feedback loop transfer function comprises a selected second order differential equation including a first variable representing a predetermined damping coefficient and a second variable representing a tuned natural frequency. The transfer function defines a frequency response having a characteristic maximum gain substantially corresponding to the value of the tuned natural frequency and creates a 90 degree phase lead substantially at the tuned natural frequency. The feedback loop output signal represents a rate of change of volume velocity to be produced by the acoustic wave actuator.
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Kashani Reza
Naastad David
Harvey Minsun Oh
The University of Dayton
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