A method and filter for suppressing power frequency harmonic interference

Abstract

The invention provides a power frequency harmonic wave interference inhibition method and a filter and relates to the signal processing field. The power frequency harmonic wave interference inhibition method and the filter help solve a problem that a conventional filter has limited power frequency inhibition effects. The method comprises the following steps: according to time domain information of originally collected signals and time domain information of a plurality of preset harmonic wave reference signals, convolution kernel information of power frequency harmonic wave interference signals which respectively correspond to all the harmonic wave reference signals is obtained; according to frequency domain information of all the harmonic wave reference signals and the convolution kernel information of the power frequency harmonic wave interference signals which respectively correspond to all the harmonic wave reference signals, total frequency domain information of all the power frequency harmonic wave interference signals is obtained; according to frequency domain information of the originally collected signals and the total frequency domain information of all the power frequency harmonic wave interference signals, first estimated frequency domain information of first signals which are obtained when all the power frequency harmonic wave interference signals are removed from the originally collected signals is obtained, and first estimated time domain information of the first signals is obtained according to the first estimated frequency domain information. A solution of the power frequency harmonic wave interference inhibition method and the filter effectively inhibit interference of the power frequency harmonic wave signals.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method and filter for suppressing power frequency harmonic interference. Background technique [0002] In the field of signal processing, such as electrocardiogram signals, image acquisition signals and electromagnetic detection signals, power frequency interference is ubiquitous. The existence of power frequency interference usually limits the signal bandwidth and detection effect of engineering applications, which is a difficult problem to overcome. Especially for the 50Hz power frequency harmonic, it is difficult to design a good narrowband filter to overcome it. Although some scholars have proposed the optimal notch filter for spectral line enhancement, or made improvements, such as the IIR lattice adaptive notch filter, which is essentially equivalent to a narrowband filter, but the power frequency suppression effect of these filters is limited. Contents of the inventio...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method and filter for suppressing power frequency harmonic interference, so as to solve the problem that the power frequency suppression effect of existing filters is limited

Images