Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1992-02-26
1995-01-31
Dwyer, James L.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
381 731, 381 94, A61F 1106, H04R 302, H04B 1500
Patent
active
053864727
ABSTRACT:
A active noise control system having a digital signal processor programmed to function as adaptive digital filter with an output saturation control is described. The programmed adaptive filter has a specified maximum value for its output signal, above which the output signal becomes clipped and a condition commonly known as filter output saturation occurs. According to the described system, the filter output signal value is monitored to detect the occurrence of filter output saturation. When output saturation is detected, the normal adaptation of the filter is modified to reduce the value of the filter output signal to prevent the further occurrence of filter output saturation. Based upon the detection of filter output saturation, a power reference level is established to estimate the maximum average power that the output signal can contain without causing saturation. The adaptation of filter weighting coefficients is then scaled in accordance with the difference between the established power reference level and a computed average power associated with the filter output signal to prevent the occurrence of filter output saturation.
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Kapsokavathis Nick S.
Pfaff Donald P.
Chiang Jack
Cichosz Vincent A.
Dwyer James L.
Funke Jimmy L.
General Motors Corporation
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