US 4,539,537 AGranted

Transversal filter having parallel inputs

AssigneeSiemens Aktiengesellschaft

InventorsHans-Joerg Pfleiderer, Karl Knauer

Life of this patent

Estimating the term…

Loading patent…

Abstract

A transversal filter with an analog shift register has a plurality of parallel inputs and a serial output at which a filtered signal appears. An object is to provide as simple as possible a realization of the n signal evaluators allocated to the n stages of the shift register. This is achieved by providing the n signal evaluators in a signal path proceeding from the input of the first stage over all n stages, and to evaluate according to evaluation factors b.sub.n through b.sub.1 which occur in the system function H(z)=b.sub.o .multidot.(1+b.sub.1 z(1+b.sub.2 .multidot.z( . . . 1+b.sub.n .multidot.z))) describing the filtered signal, where z is the delay which the signal values respectively experience when traversing a stage of the shift register. The filter is employed as an analog filter in communication technology.

Claims7

Dependent claims

A transversal filter, comprising:

an analog shift register having a plurality of parallel inputs and a serial output;
a signal input which supplies an input signal to all parallel inputs so that the input signal forms successively sampled signal values;
a serial output where a filtered output signal is available;
n signal evaluator means and n parallel inputs being respectively allocated to a group of n stages of the shift register;
the signal evaluator means in each stage being positioned in a signal path between the respective parallel input and the respective stage, and preceding stages connecting to succeeding stages through an intervening signal evaluator means;
the signal evaluator means of the first through n.sup.th stages of said group respectively evaluating according to evaluation factors b.sub.n through b.sub.1 which are determined such that the filtered signal corresponds to a system function
H(z)=b.sub.o .multidot.(1+b.sub.1 .multidot.z(1+b.sub.2 z(. . . (1=b.sub.n .multidot.z))),
where z represents a respective delay associated with one stage of the shift register when the sampled signal values are transferred, and b.sub.o represents an evaluation factor of a signal evaluator means between the serial output and a last stage of the shift register.

5 more elements

Dependencies are inferred from the claim text.