Adaptive line enhancer

Details Adaptive line enhancer Adaptive line enhancer

2005-10-11

2005-10-11

Malzahn, D. H. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C708S317000, C708S322000

Reexamination Certificate

active

06954771

ABSTRACT:
An improved adaptive line enhancer includes an adaptive Gray-Markel lattice notch filter having an adaptive notch frequency, in which the notch frequency is determined according to a notch frequency variable k. The value of k for the n+1thsample period is determined according to the following equation:in-line-formulae description="In-line Formulae" end="lead"?k(n+1)=k(n)−sgn[y(n)]sgn[UPDATEFN]×μin-line-formulae description="In-line Formulae" end="tail"?in which y(n) is the notch filter output, μ is the adaptation constant, and UPDATEFN has a transfer function in the z-transform domain of:(α-1)⁢(k⁡(n)-1)⁢z-11+k⁡(n)⁢(1+α)⁢z-1+α⁢ ⁢z-2in which α determines the bandwidth and k(n) is a variable for determining the current notch frequency. The algorithm for adapting the notch frequency enables the notch frequency to be directly calculated from knowledge of internal variables of the wave digital filter.

REFERENCES:
patent: 5808924 (1998-09-01), White
patent: 5960091 (1999-09-01), White et al.
patent: 6611602 (2003-08-01), White et al.
patent: 0343278 (1989-11-01), None
patent: WO9711538 (1997-03-01), None

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