Assembly for filtering by switching
AssigneeCommissariat a l'Energie Atomique
InventorMichel Gignoux
Life of this patent
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Abstract
The present invention relates to an assembly for filtering by switching, comprising at least one filter with switched paths and means for applying to each of the filters signals for controlling switching of the paths, said assembly further comprising means for memorizing the output signal of the filter and a mixer circuit whose input receives at a given instant the signal to be filtered; a second input receives at this instant the memorized value which the output signal had, an instant earlier, separated from the instant in question by a whole number of periods of the useful component of the input signal. The invention is applicable to harmonic analysis, telecommunications, filtering of composite signals.
Claims11
An assembly for filtering permanent useful signals by switching, comprising:
- (a) at least one filter, said filter having an input and an output a plurality of switched filtering paths said switched filtering paths having inputs and outputs, the inputs of said switched filtering paths being connected to the input of said filter and the outputs of said filtering paths being connected to the output of said filter, each of said filtering paths having a characteristic which causes its output to be delayed with respect to its input;
- (b) means for applying to each of the filtering paths switching control signals to selectively actuate said filtering paths;
- (c) means for memorizing the value of the output signal of said filter said memorizing means being associated with each of said switched filtering paths;
- and
- (d) a mixer circuit having a first input which receives at a given instant in time the signal to be filtered and a second input which receives at said given instant said memorized value whichd said output signal had, at a point in time an interval in time earlier, said point in time separated from said given instant by substantially a whole number of periods of the useful component of the input signal, and said mixer circuit correlating signals provided to the first and second inputs.
Dependencies are inferred from the claim text.