Adaptive noise canceller

Details Adaptive noise canceller Adaptive noise canceller

1993-06-02

1995-12-05

Kuntz, Curtis

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381 71, H04B 1500

Patent

active

054737028

ABSTRACT:
An adaptive filter estimates the noise component in a primary audio signal by convolving a secondary audio signal with a set of coefficients. The estimated noise component is subtracted from the primary audio signal to produce an output signal. During steady-state operation, the adaptive filter coefficients are updated as to minimize the difference between the primary audio signal and the estimated noise component. Steady-state operation is identified automatically by monitoring the power level of the primary or secondary audio signal, or the power level of the output signal. Coefficient updating is suspended when the monitored power level rises from a steady state to an unsteady state, and is resumed when the monitored power level returns to its previous steady-state level, or settles into a new steady state.

REFERENCES:
patent: 4672674 (1987-06-01), Clough et al.
patent: 5192918 (1993-03-01), Sugiyama
patent: 5243661 (1993-09-01), Ohkubo et al.

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