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Construction method of frequency-selecting filter and construction method for realizing FIR-type and IIR-type filters by adopting same

A frequency-selective filter and construction method technology, applied in the information field, can solve problems such as inability to generate compilable source files, cumbersome design of frequency-selective filters, etc., and achieve the effects of improved construction accuracy and efficiency, easy adjustment, and convenient viewing

Inactive Publication Date: 2010-10-13
刘海成 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for generating customizable sources that have specific filters or graphs attached thereto. It also enables users to easily find out which parts they want filtered by referring to their own characteristics such as how well these filters work at certain frequencies. These results improve the quality of filtration provided through them while making maintenance easier.

Problems solved by technology

This patents describes different ways to improve the performance (speed) and complexity of analog signals processed through digital techniques such as filtering and amplification. These improvements include reducing computational load during calculation, simplifying the processors' working loads, improving efficiency, enhancing accuracy, adaptability, and ease of implementation across multiple platform environments.

Method used

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  • Construction method of frequency-selecting filter and construction method for realizing FIR-type and IIR-type filters by adopting same
  • Construction method of frequency-selecting filter and construction method for realizing FIR-type and IIR-type filters by adopting same
  • Construction method of frequency-selecting filter and construction method for realizing FIR-type and IIR-type filters by adopting same

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specific Embodiment approach 1

[0060] Specific implementation mode 1. Combination figure 1 Illustrate this specific embodiment, a kind of construction method of frequency selective filter, it is finished by the following steps:

[0061] Step 1. Select the type of filter to be constructed;

[0062] Step 2, setting filter parameters for the filter of the type selected in step 1;

[0063] Step 3. The system meets the required filter order or window length according to the filter parameter budget set in step 2;

[0064] Step 4. Adjust the parameters of the filter to be constructed according to the filter order or window length obtained in Step 3;

[0065] Step 5, constructing a filter according to the adjusted filter parameters to be constructed obtained in step 4, and obtaining filter coefficients and filter characteristic results;

[0066] Step 6. Determine whether the filter characteristic result obtained in step 5 meets the requirements. If the judgment result is yes, then complete the construction of th...

specific Embodiment approach 2

[0072] Specific embodiment two, combine figure 2 Illustrate this specific embodiment, based on the construction method of the FIR type filter of the construction method of a kind of frequency-selective filter described in claim 1, it is completed by the following steps:

[0073] Step A, select the type of the FIR filter to be constructed, and set the parameters of the FIR filter to be constructed, the parameters comprising: sampling rate, passband cutoff frequency, stopband cutoff frequency and stopband minimum attenuation value;

[0074] Step B, normalizing the parameters set in step A to obtain normalized digital parameters;

[0075] Step C, the system generates budget parameters according to the normalized digital parameters obtained in step B, and the budget parameters include: window type, window length and minimum attenuation value of the stop band of the window that meet the requirements;

[0076] Step D, adjusting the window type and window length of the FIR filter ...

specific Embodiment approach

[0123] Set the filter type to: low pass, set the sampling rate: 48000, the cut-off frequency of the passband: 6000, the cut-off frequency of the stopband: 8000, the minimum attenuation of the stopband: 15dB, after the parameters are set, the system will automatically give the Budget parameters, the type of window is a rectangular window, the length of the window is 22, and the minimum attenuation of the stop band of this window is 21dB. Select the Blackman window, select the default 132 for the length of the window, and click "Design". The system will calculate the coefficients of the filter and generate seven corresponding graphs: logarithmic amplitude-frequency characteristic graph ( Figure 4 ), amplitude-frequency characteristic diagram ( Figure 5 ), phase-frequency characteristic diagram ( Figure 6 ), group delay characteristic diagram ( Figure 7 ), zero-pole distribution diagram ( Figure 8 ), the unit impulse response diagram ( Figure 9 ), the unit step respons...

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Abstract

The invention discloses a construction method of a frequency-selecting filter and a construction method for realizing FIR-type and IIR-type filters by adopting the same, relates to the technical field of information, solves the problems of fussy conventional manual design of the filter and low efficiency and low accuracy of the manual design and also provides a rapid and accurate output function which can directly use an output file in the design of an embedded system. The method comprises the following steps of: through set parameters, budgeting and regulating corresponding parameters according to the parameters to construct a filter and generate an amplitude-frequency characteristic diagram, a log magnitude-frequency characteristics diagram, a frequency-phase characteristic diagram, a unit step response diagram, a unit impulse response diagram, a group delay characteristic diagram and a zero-pole point distribution diagram; if the construction requirement is not met, returning to reset the parameters; and if the construction requirement is met, outputting the constructed filter. The invention is suitable for construction of the filters.

Description

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Claims

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Application Information

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Owner 刘海成
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