Active noise control system

Details Active noise control system Active noise control system

2006-01-24

2006-01-24

Pendleton, Brian T. (Department: 2644)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

C381S071400, C381S055000

Reexamination Certificate

active

06990207

ABSTRACT:
An active noise control system for reducing road noise of low frequency generated inside the cabin of a vehicle is provided. The active noise control system includes a noise detector, a signal generator for processing the input noise signal to generate a signal for producing noise canceling waves, a limiting amplifier having a specified threshold value for variably amplifying the processed signal so that the amplitude of output signal will not exceed the threshold value, and an electrical acoustic converter for producing noise canceling acoustic waves in accordance with the output signal.

REFERENCES:
patent: 4455675 (1984-06-01), Bose et al.
patent: 4953217 (1990-08-01), Twiney et al.
patent: 5469510 (1995-11-01), Blind et al.
patent: 5577126 (1996-11-01), Klippel

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