A method and filter for suppressing power frequency harmonic interference

A technology of harmonic interference and harmonics, applied in the field of signal processing, can solve the problem of limited power frequency suppression effect of filters, and achieve the effect of improving the signal-to-noise ratio, suppressing power frequency harmonic signals, and reducing complexity.

Active Publication Date: 2017-06-23
VIVO MOBILE COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • A method and filter for suppressing power frequency harmonic interference
  • A method and filter for suppressing power frequency harmonic interference
  • A method and filter for suppressing power frequency harmonic interference

Examples

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no. 1 example

[0028] Such as figure 1 As shown, the method for suppressing power frequency harmonic interference in the embodiment of the present invention includes:

[0029] Step 101, according to the time domain information of the original acquisition signal and the time domain information of a plurality of preset harmonic reference signals, obtain the convolution kernel information of the power frequency harmonic interference signal corresponding to each harmonic reference signal.

[0030] Here, the harmonic reference signal corresponds to the power frequency harmonic interference signal in the engineering signal, the number of harmonic reference signals is the number of power frequency harmonic interference signals in the frequency band of the engineering signal, and the frequency of the harmonic reference signal is equal to the corresponding The frequency at which harmonics of the power frequency interfere with the signal.

[0031] Step 102, according to the frequency domain informati...

no. 2 example

[0037] The method for suppressing power frequency harmonic interference in the embodiment of the present invention includes:

[0038] Step 1011, according to the time domain information of the original acquisition signal and the time domain information of each harmonic reference signal, obtain the cross power spectrum information of each harmonic reference signal and the original acquisition signal respectively.

[0039] Step 1012, according to the time domain information of each harmonic reference signal, obtain the self-power spectrum information of each harmonic reference signal.

[0040] Step 1013, according to the self-power spectrum information and the corresponding cross-power spectrum information of each harmonic reference signal, obtain the convolution kernel information of the power frequency harmonic interference signal corresponding to each harmonic reference signal.

[0041] Here, the self-power spectrum information of each harmonic reference signal is not correla...

no. 3 example

[0073] The method for suppressing power frequency harmonic interference in the embodiment of the present invention includes:

[0074] Step 101, according to the time domain information of the original acquisition signal and the time domain information of a plurality of preset harmonic reference signals, obtain the convolution kernel information of the power frequency harmonic interference signal corresponding to each harmonic reference signal.

[0075] Step 102, according to the frequency domain information of each harmonic reference signal and the convolution kernel information of the power frequency harmonic interference signal corresponding to each harmonic reference signal, obtain the total frequency domain information of all power frequency harmonic interference signals.

[0076] Step 103, according to the frequency domain information of the original acquisition signal and the total frequency domain information of all power frequency harmonic interference signals, obtain t...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H21/00
Inventor 朱锋
Owner VIVO MOBILE COMM CO LTD
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