Method for designing finite impulse response digital low-pass filter

A low-pass filter and long-pulse technology, which is applied in the direction of digital technology network, impedance network, electrical components, etc., can solve the problems of small amount of calculation and unsatisfactory optimization performance, and achieve improved convergence speed, less adjustable control parameters, Prevent getting stuck in local optimum

Active Publication Date: 2017-07-04
XIDIAN UNIV
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The main feature of the algorithm based on the local neighborhood search technology is that the amount of c...

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  • Method for designing finite impulse response digital low-pass filter
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  • Method for designing finite impulse response digital low-pass filter

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[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] Embodiments of the present invention provide a method for designing a finite-length impulse response digital low-pass filter, such as figure 1 As shown, the method includes the following steps:

[0024] Step 1, setting the parameters of the ideal low-pass filter, and obtaining the frequency response function of the ideal low-pass filter according to the parameters of the ideal low-pass filter.

[0025] The step 1 specifically includes the following sub...

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Abstract

The invention belongs to the field of digital signal processing, and discloses a method for designing a finite impulse response digital low-pass filter. The method comprises the following steps: setting a frequency response function of an ideal low-pass filter; setting a frequency response function of an analog low-pass filter; setting a fitness function of a particle swarm algorithm; obtaining a position matrix of initial population particles and a velocity matrix of the initial population particles; obtaining the particle position corresponding to the minimum fitness function of each particle in an initial population and the particle position corresponding to the global minimum fitness function in the initial population; updating the velocity matrix, the position matrix, the particle position corresponding to the minimum fitness function of each particle, and the particle position corresponding to the global minimum fitness function; and obtaining the final analog low-pass filter according to the particle position corresponding to the global minimum fitness function. Thereby, the designed filter has a more flat passband and stronger stopband attenuation.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, in particular to a method for designing a finite-length impulse response digital low-pass filter. Background technique [0002] The finite impulse response digital filter (FIR) is the most basic component in the digital signal processing system. It can guarantee arbitrary amplitude-frequency characteristics while having strict linear phase-frequency characteristics. At the same time, its unit sampling response is finite. Thus the filter is a stable system. It has a wide range of applications in communications, radar, sonar, biomedicine, and seismic exploration. Traditional FIR digital filter design methods include frequency decimation method, window function method and uniform approximation method. The frequency extraction method and the window function method are simple and easy to implement, but it is not easy to accurately determine the boundary frequency of its passband an...

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Application Information

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IPC IPC(8): H03H17/00
CPCH03H17/00H03H2017/0081
Inventor 王彤高海龙
Owner XIDIAN UNIV
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