Patent ID: 6938063
Filing Date: 2005-08-30
Classification: H03H

Abstract:
1. A filter comprising a plurality of interconnected modular basic units, and a delay line equipped with takeoff points to furnish delayed sampling values (x 1 , . . . , xN; xi) of a digital signal (x), such that the delay times of the sampling values are integer multiples n of the period with n=0, 1, 2, 3, . . . of a sampling clock pulse coupled to the digital signal (x), each basic unit contains a programmable weighting device, a linkage device, and a delay device, which delays the data conducted to it by a single period (T) of the sampling clock pulse or by a simple integer multiple thereof, and the filter further contains a programmable control device, which switches over or switches off a part, especially half, of the data inputs of the basic unit to achieve forward and/or backward filtering and/or sign inversion and/or a change of the active filter length, wherein the programmable control device comprises a sign inverter, which, in dependence on a third control signal (I), inverts the signs of the data values passed through it, which are conducted to the associated data inputs of the interconnected modular basic units, and said programmable control device further comprises a second switching device, which, in dependence on a second control signal (P), switches into an ineffective state a last stage (N) of the delay line and/or a data input.