Interference suppression for measuring signals with periodic wanted signals
First Claim
1. A method of suppressing interferences in a physical measurement signal with a substantially periodic useful signal, comprising the steps of:
- (a) transforming, preferably by means of a wavelet transform, the measurement signal into a summation of aperiodic basic functions, each member of the sum comprising a coefficient;
(b) characterizing those coefficients which exceed a given threshold value as interference coefficients which have presumably been influenced by interference;
(c) manipulating the interference coefficients for suppressing the interferences; and
(d) transforming the summation manipulated in step (c) back into a measurement signal with interference suppression.
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Abstract
The invention relates to a method for suppressing the interferences in a measuring signal with a substantially periodic wanted signal. According to the method, first a transformation, preferably a wavelet transformation, of the measuring signal to a summation of aperiodic basic logic functions is carried out, wherein each element of the sum has a coefficient. Those coefficients that exceed a predetermined threshold value are characterized as interference coefficients that are presumably influenced by interferences and the interference coefficients are manipulated to suppress the interferences. The manipulated summation is then retransformed to an interference-suppressed measuring signal. An undisturbed base signal is shown as curve 300 (thin) and the disturbed signal as curve 310 (extra-bold). The curve 320 (bold) shows the signal screened according to the invention, by starting from curve 310 and carrying out the embodiment presented in the invention.
295 Citations
14 Claims
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1. A method of suppressing interferences in a physical measurement signal with a substantially periodic useful signal, comprising the steps of:
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(a) transforming, preferably by means of a wavelet transform, the measurement signal into a summation of aperiodic basic functions, each member of the sum comprising a coefficient;
(b) characterizing those coefficients which exceed a given threshold value as interference coefficients which have presumably been influenced by interference;
(c) manipulating the interference coefficients for suppressing the interferences; and
(d) transforming the summation manipulated in step (c) back into a measurement signal with interference suppression. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A device for suppressing interference in a physical measurement signal with a substantially periodic useful signal, comprising:
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means for transforming, preferably by means of a wavelet transform, the measurement signal into a summation of aperiodic basic functions, each member of the summation having a coefficient, means for characterizing those coefficients which exceed a given threshold value as interference coefficients which have presumably been influenced by interference, means for manipulating the interference coefficients so as to suppress the interference, and means for transforming the manipulated summation back into an interference-suppressed measurement signal. - View Dependent Claims (14)
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Specification