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Abstract

Circuitry is disclosed for converting an input measurement signal V.sub.R(i), which is disturbed at least occasionally by a disturbance function, into an output, undisturbed signal V.sub.R(o) by means of a first digital adaptive filter having variable filter parameters. A control circuit is provided to change to parameters of the second adaptive filter to improve the ability of the system to filter out the disturbance signal. The apparatus includes a series circuit formed by a high pass filter and a second digital adaptive filter, coupled to receive the input signal V.sub.R(i). The control circuit switches the second adaptive filter to the adaptation mode, for determining the filter parameters necessary for suppression of the disturbance function n, when essentially only the disturbance signal reaches the second adaptive filter. Thereafter, the filter parameters of the second adaptive filter are transferred to the first adaptive filter to improve the performance of the first adaptive filter.

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