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Method of high-fidelity filtering for power frequency interferences in multichannel feeble physiological information recording system

A technology of physiological information and recording system, which can be used in diagnostic recording/measurement, medical science, sensors, etc., and can solve problems such as errors

Inactive Publication Date: 2014-06-04
XI AN JIAOTONG UNIV
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Problems solved by technology

This is not a bad thing in itself, but when it is beneficial to estimate the sine wave to subtract power frequency electrical interference, it is easy to cause a larger error than the channel subject to large interference

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  • Method of high-fidelity filtering for power frequency interferences in multichannel feeble physiological information recording system
  • Method of high-fidelity filtering for power frequency interferences in multichannel feeble physiological information recording system
  • Method of high-fidelity filtering for power frequency interferences in multichannel feeble physiological information recording system

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Embodiment Construction

[0023] see figure 1, first analyze the N channels one by one. The data of each channel is subdivided into M data units. As long as such data units are sufficiently short, eg, a few seconds, it is reasonable to assume that the sine wave of the power-frequency electrical interference therein is stationary so that the three basic parameters, frequency, amplitude and phase, remain unchanged. The envelope check is further performed on the data of this data unit to check whether there is impact interference. If there is no shock interference, use the traditional STEM method (Grandke T. Interpolationalgorithms for discrete Fourier transforms of weighted signals. IEEE Trans Instrum Meas 1983; IM-32: 350–5.) to estimate the three basic parameters of the sine wave, if there is shock interference , using the RAW-STEM method (Tongsheng Zhang and Yoshio Okada, Recursive artifact windowed–single tone extraction method (RAW–STEM) as periodic noise filter for electrophysiological signals wi...

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Abstract

Disclosed is a method of high-fidelity filtering for power frequency interferences in a multichannel feeble physiological information recording system. The method includes: estimating parameters of power-frequency electrical interference sine wave by a high Signal-to-noise ratio channel according to characteristics of a multichannel measurement system. The calculated frequency is the power-frequency electrical interference frequency for all channels, whether calculated phase is 180-degree reverse phase or not is determined according to specific spatial distribution of the channels in the recording system, and the determination can be achieved according to the power-frequency electrical interference sine wave parameters estimated according to channel information. Accurate estimation on two of three parameters is obtained for all channels, especially the low signal-to-noise ratio channels, as the high signal-to-noise ratio channels. Estimation on amplitude of the interference in the low signal-to-noise ratio channels is optimized for the amplitude of the last one in the three parameters according to the relation. Relative ratio of the amplitudes of the power-frequency interferences in all channels is kept constant, so that accuracy in estimating the low signal-to-noise ratio channels is increased.

Description

technical field [0001] The invention relates to a high-fidelity filtering method for power frequency electrical interference, in particular to a high-fidelity filtering method for power frequency interference in a multi-channel weak physiological information recording system. Background technique [0002] The interference of the fundamental wave and harmonics of the power frequency to the measurement information is a fundamental problem that cannot be avoided in the measurement of signals in the same frequency band as the power frequency since the electronic age. For example, the 50 Hz alternating current in my country (60 Hz in North America) just falls in the Gamma band in the EEG information. And its several low-order harmonics are also included in the range of many physiological electrical activities, such as ventricular late potential and Fast Ripple information in EEG. In order to eliminate power frequency interference, many effective filtering methods have been inven...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/04
Inventor 张通胜王珏
Owner XI AN JIAOTONG UNIV