Active noise control system with on-line secondary path...

Details Active noise control system with on-line secondary path... Active noise control system with on-line secondary path...

2005-01-25

2005-01-25

Isen, Forester W. (Department: 2644)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

C381S071100, C381S071500, C381S071120

Reexamination Certificate

active

06847721

ABSTRACT:
An active noise control system is provided to specify an input transducer, an error transducer, an output transducer and an active noise controller for generating an anti-phase canceling acoustic signal to attenuate an input noise and to output a reduced noise. The active noise control system also performs on-line secondary path modeling. For this purpose the active noise control system comprises, in addition to known systems, a secondary path change detection circuitry (6), a signal distinguishing circuitry (7) and an auxiliary noise control circuitry (8), all of them being used to model said secondary path.

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P.A. Nelson & J. S. Elliot, “Active Control of Sound,” Academic (New York), (Jun. 5, 1992).
S.M. Kuo & D.R. Morgan, “Active Noise Control Systems—Algorithms and DSP Implementation,” Wiley (New York), (Jun. 5, 1996).

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