Patent ID: 6269115
Filing Date: 2001-07-31
Classification: H03H

Abstract:
A forward impulse response, linear-phase matched filter, receiving as an input a sampled digital representation of an input signal, x(n), having n samples, and providing a filtered output, y.sub.a (n), having K stages, stage 0, stage 1, . . . stage k, . . . stage K-2, stage K-1, comprising:means in stage 0 for multiplying the values x(n) by the value ##EQU28##to generate values v.sub.0 (n);means in stages 1 though K-1 for generating the values v.sub.k (n) for k=1.fwdarw.K-1, wherev.sub.k (n)=v.sub.k-1 (n-1)(z.sup.-1 -b)/(1-bz.sup.-1);means in stages 0 through K-1 for multiplying v.sub.k (n) by a respective constant value, c.sub.k ; for generating a series of intermediate values i.sub.k ; andmeans for summing said intermediate values to produce said filtered output, y.sub.a (n); whereinthe value b is a Laguerre parameter,the value z is a z-transform of the filter behavior,a predetermined limiting function is applied in determining the value v.sub.k (n) to reduce the number of multiplications necessary to implement the filter function, while avoiding instabilities in the filter so implemented.