A filtering method for a filtering system

A filtering method and system function technology, applied in the direction of impedance network, digital technology network, electrical components, etc., can solve problems such as unfavorable practical application, long filtering delay, large amount of calculation, etc.

Active Publication Date: 2017-11-28
GUANGDONG BIOLIGHT MEDITECH CO LTD
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Problems solved by technology

Although the FIR filter has good linear phase characteristics, it is generally necessary to use a high-order FIR filter to meet the design requirements. Therefore, the FIR filter has a large amount of calculation and a long filtering delay, which requires high chip requirements in practical applications. , which is not conducive to practical application
[0005] 2. The wavelet transform is used to process the ECG signal, but the method has a large amount of computation, and it is easy to cause signal distortion when reconstructing the signal
However, its filtering effect is related to the length of the selected signal segment. The existing technology uses a signal segment length whose filtering delay is 4 times, corresponding to the number of filters used is 3, but its algorithm has a long time delay, so it cannot Good for real-time signal processing, not an optimal solution

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Embodiment Construction

[0044] The invention provides a filtering method of a filtering system, referring to figure 1 As shown, the filtering system includes a sequentially connected one-input-multiple-out LIFO queue, a first IIR filter, a one-input-one-out LIFO queue and a second IIR filter. The ECG signal x(n) is processed by a LIFO queue with one input and multiple output to generate data b(n), b(n) is filtered by the first IIR filter FILTER1 and output d(n), after that, d (n) After entering the one-in-one-out LIFO queue for processing, it is filtered by the second IIR filter FILTER2 to generate the final signal y(n).

[0045] The filtering method of described filtering system comprises:

[0046] (1) Obtain the system function H(z) of the IIR filter according to the actual application, and determine the equal-length segment length L required by the system function H(z) according to the accuracy adopted.

[0047] Among them, the system function H(z) of the IIR filter is obtained by determining it...

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Abstract

The invention discloses a filtering method of a filtering system. The filtering system includes a sequentially connected one-input-multiple-out LIFO queue, a first IIR filter, a one-input-one-out LIFO queue and a second IIR filter. The filtering method first obtains the system function H (z) of the IIR filter according to the actual application, and determines the required equal-length segment length L of the system function H (z) according to the precision adopted; after that, for the center of the sampling frequency fs Electric signal x(n), set the input array Div_x(n) corresponding to ECG signal x(n), divide the array into N_block segments, each segment length is M, and M=L / 2; after that, each A data stream is filtered through a filtering system. The present invention reduces the number of filters and at the same time reduces the delay of filtering.

Description

technical field [0001] The invention relates to the field of electrocardiographic signal processing, in particular to a filtering method of a filtering system. Background technique [0002] During the acquisition process of ECG signal, it is inevitable to mix various noises. External interference such as power frequency interference and high frequency has caused adverse effects on the collection of ECG signals and further accurate analysis and diagnosis. Therefore, in the process of actually collecting and analyzing ECG signals, it is necessary to filter out these interferences. In the actual filtering process, it is often desired not to change the waveform or reduce the distortion of the waveform, and because the ECG signal is relatively sensitive to the phase, it is required that the designed filter should preferably have a good linear phase response. [0003] At present, there are many methods to filter out the baseline drift interference of the ECG signal and the inter...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H03H17/00
Inventor闵苏勾大海
OwnerGUANGDONG BIOLIGHT MEDITECH CO LTD