Digital filter designing method, digital filter designing program, digital filter

A digital filter and design method technology, applied in the direction of digital technology network, impedance network, electrical components, etc., can solve the problems of increased processing load, complex coefficient value, large number of filter taps, etc., to reduce the number of circuit components, reduce The effect of consuming power and reducing the computational load

Inactive Publication Date: 2005-09-14
NEURO SOLUTION CORP
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Problems solved by technology

[0007] However, the above-mentioned conventional filter design method requires skilled technicians to spend time and effort to design, and thus there is a problem that an FIR filter with desired characteristics cannot be easily designed.
[0008] In addition, even if it is assumed that an FIR filter close to the required characteristics can be designed, the number of taps of the designed filter

Method used

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  • Digital filter designing method, digital filter designing program, digital filter
  • Digital filter designing method, digital filter designing program, digital filter
  • Digital filter designing method, digital filter designing program, digital filter

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Embodiment Construction

[0043]First, before describing the embodiments of the present invention, the outline of Japanese Patent Application No. 2001-400673 (hereinafter referred to as "filed application") filed by the applicant of the present application will be described below. This proposed application is to use four kinds of basic unit filters F0, F1, F2, F3 described below to make four kinds of unit filters L1n, L2n, H1n, H2n, and only use these combinations to design the FIR filter that requires frequency characteristics.

[0044] FIG. 1 is a diagram showing the above four basic unit filters F0 to F3, (a) shows the circuit structure, and (b) shows the numerical sequence of the filter coefficients. As shown in Figure 1(a), five D-type flip-flops 1 connected in cascade are used in the basic unit filters F0-F3 -1 ~1 -5 The input signals are sequentially delayed by 1 clock CK. Then, for each D-type flip-flop from 1 -1 ~1 -5 The signal taken out by the input and output taps is passed through 6 c...

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Abstract

According to a basic unit filter having a predetermined basic numeric string as a filter coefficient, a high-pass unit filter (H15) and a low-pass unit filter (L13) having pass ranges having a common center frequency Fc are created. These are connected in the longitudinal way to design a band pass filter. Characteristic values obtained by combining a few types of unit filters are cancelled by each other. Thus, without pulling out a necessary frequency band and only by the longitudinal connection of the high-pass unit filter (H15) and the low-pass unit filter (L13), it is possible to extract a superimposed portion as a band pass filter pass range.

Description

technical field [0001] The present invention relates to a design method of a digital filter, a program for designing a digital filter, and a digital filter; in particular, it relates to a delay line with a plurality of taps composed of delayers, and adding each tap signal after multiplying it by several times. And output the FIR filter design method. Background technique [0002] In various electronic devices provided in various fields such as communication, surveying, audio / image signal processing, medical treatment, and seismology, some kind of digital signal processing is generally performed inside. Among the most important basic operations in digital signal processing, there is filtering processing to extract only signals in a desired frequency band from an input signal mixed with various signals or noise. Therefore, most electronic devices that perform digital signal processing use digital filters. [0003] Most digital filters use IIR ((Infinite Impulse Response: Inf...

Claims

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Application Information

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IPC IPC(8): H03H17/02H03H17/06
CPCH03H17/0264H03H17/0283H03H17/026H03H17/06
Inventor 小柳裕喜生
Owner NEURO SOLUTION CORP
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