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

A technology of IIR filter and filtering device, applied in the field of signal processing

Active Publication Date: 2012-07-04
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

[0041] Below in conjunction with accompanying drawing, the present invention will be further described:

[0042] Such as figure 1 and figure 2 As shown, for the ECG signal s[n] whose sampling frequency is fs, an input array In_Put is defined, which can be evenly divided into N_block segments, and each segment has a length of Len_sto. The selection of N_block is related to the selection of the 3dB cut-off frequency fc and filter parameters of the whole system.

[0043] When receiving a piece of ECG data with a length of Len_sto, assign the second piece of Len_sto data in the In_Put array to the first piece in turn, and the third piece to the second piece, ..., the value of each element of the N_block section in turn is the received new ECG data. The reason for this processing is mainly to reduce the delay time while taking into account the efficiency of calculation.

[0044] The input array In_Put is initialized to zero, when a piece of ECG data with a length of Len_sto is...

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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, myoelectric interference and various high-frequency interferences, which have a great impact on the signal. There are currently many methods for digital filtering of ECG baseline drift, [1], Wu Xiangming, Wu Xiaohui, Song Shuixiao, Experimental Research on the Causes of ECG Baseline Drift and Its Elimination "Journal of Cardiology", Volume 8, Issue 3, 1989, starting and ending page numbers: 191-192. [2] Analysis of the Baseline Drift in Zhao Peng's ECG Machine "Gansu Science and Technology Aspect", Volume 33, Issue 6, 2004, starting and e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/00G06F17/00
Inventor 孔令锋魏大雪
Owner EDAN INSTR
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