Digital filter having improved overload recovery...

Details Digital filter having improved overload recovery... Digital filter having improved overload recovery...

2005-09-22

2010-02-09

Ngo, Chuong D (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C708S306000

Reexamination Certificate

active

07660839

ABSTRACT:
A digital filter having improved overload characteristics provides improved performance in audio equalizers and other systems. In contrast to a standard digital filter, clipping is enforced at the output of the filter and an integrator is used to implement the first filter stage, which is then followed by another stage that may be a unit delay or an integrator. Scalers and combiners are provided to scale an input signal representation and the output signal representation and combine them to provide the particular coefficient inputs to the integrator and the second stage forming a direct form filter. The resulting filter implements the same transfer function as a corresponding direct form filter, with an improved recovery from internal overload conditions. Higher-order filters can be formed by cascading the second-order filters formed by multiple integrator/second stage pairs.

REFERENCES:
patent: 4223389 (1980-09-01), Amada et al.
patent: 4920507 (1990-04-01), Takeda
patent: 7062340 (2006-06-01), Melanson
Roberts, Richard A. and Mullins, Clifford T. “Digital Signal Processing”, Addison-Wesley, Reading MA, 1987, pp. 297-316.

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