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A digital filtering processing method of an online zero-phase-shift iir digital filter

A technology of digital filter and processing method, applied in the direction of digital technology network, impedance network, electrical components, etc., can solve problems such as head and tail distortion of block signal sequence, and achieve the effect of small distortion

Active Publication Date: 2017-10-31
FLIGHT AUTOMATIC CONTROL RES INST
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Problems solved by technology

At present, the design of online zero-phase-shift filters at home and abroad generally adopts block inversion technology, but the distortion at the beginning and end of the block signal sequence is relatively large

Method used

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  • A digital filtering processing method of an online zero-phase-shift iir digital filter
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  • A digital filtering processing method of an online zero-phase-shift iir digital filter

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Embodiment Construction

[0019] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, firstly, the impulse response h[n] of the IIR digital filter H(z) is truncated, and the finite impulse response of length L is used Approximate h[n]. The truncation length L needs to satisfy the given input test signal t[k]

[0021]

[0022] In the above formula (1), u[n] is the output whose input is t[k] and the impulse response is h[n], v[n] is the input is t[k], and the impulse response is The output of , the threshold ε is determined according to the approximate accuracy.

[0023] Then, for output y[i] at time i, the input signal sequence {x[i],x[i+1],...,x[i+L-1]} of length L is collected from time i.

[0024] Then, if figure 2 Shown for the input signal sequence {x[i],x[i+1],...,x[i+L-1]} and finite impulse response Use the following formula to calculate

[0025]

[0026] Then, the sig...

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Abstract

The invention belongs to the technical field of digital signal processing, and relates to a digital filtering processing method of an online zero-phase-shift IIR digital filter. The present invention includes: 1.1) truncate the impulse response h[n] of the IIR digital filter H(z), and approximate h[n] with a finite impulse response of length L; 1.2) from moment i, Firstly, the input signal sequence with a length of L is collected; 1.3) Use the finite impulse response and the input signal sequence to perform inverse filtering and convolution processing to obtain w[i]; 1.4) Send w[i] to the IIR digital filter H(z ) performs forward filtering recursive processing, and outputs an approximate zero-phase-shift signal y[i]. The invention has a small degree of distortion, can be applied to engineering practice, and can obtain good results.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, and relates to a digital filtering processing method of an online zero-phase-shift IIR digital filter. Background technique [0002] The complex amplitude of each frequency component in the digital signal, that is, the mode and phase, will be changed by the gain and phase shift of the system frequency response of the filter after passing through the digital filter. The phase shift of the system can change the relative phase relationship between the components in the input signal, so that even if the gain of the system is constant for all frequencies, it is possible to produce a large change in the time domain characteristics of the input, resulting in phase distortion. Especially for the infinite impulse response filter (IIR filter), its nonlinear phase characteristics will cause phase distortion of the signal in the passband. In some digital signal processing applications, su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
Inventor 王袆敏雷宝权李国玉刘小溪许大川祝运刚
Owner FLIGHT AUTOMATIC CONTROL RES INST