Active noise control system

Details Active noise control system Active noise control system

2004-05-27

2008-03-04

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

C381S056000, C381S071200, C381S071400, C381S071800, C708S322000

Reexamination Certificate

active

07340064

ABSTRACT:
An active noise control system is provided which cancels a noise using a secondary noise from a speaker that is operated in accordance with an output from an adaptive controller. The system is configured such that microphone monitor interrupts a switch to thereby stop the secondary noise from being produced, when an error signal delivered by a microphone used for an adaptive computation in an LMS processing portion has the same sign for a predetermined duration. This allows the system to prevent the user from hearing an abnormal acoustic noise resulting from an abnormal operation or divergence of an adaptive filter even when the output signal from the microphone used for the adaptive computation is indicative of an abnormal level.

REFERENCES:
patent: 5455779 (1995-10-01), Sato et al.
patent: 06-250671 (1994-09-01), None

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