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Zero phase implementation method of IIR filter and zero phase IIR fiter

A technology of IIR filter and filtering device, which is applied in the field of signal processing and achieves the effect of less average calculation amount

Active Publication Date: 2009-02-11
EDAN INSTR
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Problems solved by technology

We point out without proof that although this method solves the problem of real-time filtering, it will introduce a periodic noise-the truncation effect problem

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  • Zero phase implementation method of IIR filter and zero phase IIR fiter
  • Zero phase implementation method of IIR filter and zero phase IIR fiter
  • Zero phase implementation method of IIR filter and zero phase IIR fiter

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings:

[0022] like figure 1 and figure 2 As shown, for the ECG signal s[n] with a sampling frequency of fs, an input array In_Put is defined, and the array can be evenly divided into N_block segments, and the length of each segment is Len_sto. The selection of N_block is related to the selection of the 3dB cutoff frequency fc and filter parameters of the entire system.

[0023] When a piece of ECG data with a length of Len_sto is received, the second segment of Len_sto data in the In_Put array is assigned to the first segment in turn, the third segment is assigned to the second segment, ..., the value of each element in the N_block segment is sequentially is the new ECG data received. The reason for this processing is mainly to reduce the delay time and take into account the efficiency of the calculation.

[0024] The input array In_Put is initialized to zero. When a pie...

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Abstract

The invention discloses a zero phase realization method of an IIR wave filter, which comprises the following steps: firstly carrying out backward wave filtering to input signals, carrying out forward wave filtering to the revised wave filtering signals through a forward IIR wave filter, leading designed wave filtering devices to keep zero phase under the condition of keeping the steep amplitude-frequency characteristic of the IIR wave filter, so as to reduce the influence on the wave form of a nonlinear phase after the wave filtering. The zero phase realization method of the IIR wave filter is suitable for not only offline signal processing but also online signal processing.

Description

Technical field: [0001] The invention relates to the field of signal processing, in particular to a method for performing zero-phase filtering on baseline drift components in physiological signals. Background technique: [0002] In the process of collecting, amplifying, detecting and recording physiological signals such as ECG signals, various interferences from the outside world mainly include power frequency interference, baseline drift, EMG interference and various high-frequency interferences, which have a great impact on the signal. There are many methods to digitally filter the baseline drift of the ECG signal, [1], Wu Xiangming, Wu Xiaohui, Song Shuixiao Experimental study on the causes and elimination of ECG baseline drift "Journal of Electrocardiography", 1989, Volume 8, Issue 3, starting and ending pages: 191-192. [2], Analysis of baseline drift phenomenon of Zhao Peng electrocardiograph, "Gansu Science and Technology", 2004, volume 33, issue 6, starting and endin...

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Application Information

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IPC IPC(8): A61B5/00G06F17/00
Inventor 孔令锋魏大雪
Owner EDAN INSTR
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