A new design method of low-pass filter based on transfer function and data processing
A low-pass filter and transfer function technology, applied in the field of new low-pass filter design, can solve the problems that the filter cannot be flexibly adapted and cannot meet the characteristics of different filtering objects, and achieve flexible design, increased adjustable parameters, Data processing Computational complex effects
Active Publication Date: 2020-06-30
YANTAI NANSHAN UNIV +1
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[0003] The purpose of the present invention is to provide a new low-pass filter design method based on transfer function and data processing, which solves the problem that traditional filters cannot flexibly adapt to actual needs and cannot meet the needs of different filtering object characteristics
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[0034] The present invention will be described in detail below in combination with specific embodiments.
[0035] According to the idea of transfer function, the present invention lists the expression relationship of input and output signals, converts it into a differential equation, and adds a stable nonlinear function to expand it, and then adopts the idea of data processing to discretize the nonlinear differential equation, through The data of the first j sampling points of the input signal, the data of the first k sampling points and the data of the first l sampling points of the output signal are weighted and summed, and finally the new filtered signal data relational expression is obtained, so as to achieve low input signal Through filtering, the high-frequency signal in the input signal is filtered out, and the low-frequency signal is retained, so that it can be applied to data processing that needs to eliminate high-frequency noise in various projects. The steps of...
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The invention discloses a novel low-pass filter design method based on transfer functions and data processing. The novel low-pass filter design method comprises the steps of: listing the expression of input and output signals according to a first-order inertial link transfer function at first; describing the input and output relational expression expressed by the transfer function by adopting a differential equation; performing nonlinear expansion of the differential equation; performing discretization of the expression of the input and output signals; and performing weighted summation of the discrete expression according to the idea of data processing, wherein signals are input; proper filtering parameters are selected; furthermore, an output curve is observed; therefore, the final low-pass filter parameters are determined; and thus, the whole low-pass filter has satisfactory low-pass characteristics. Compared with the traditional low-pass filter design, the novel low-pass filter design method disclosed by the invention has the benefits that: the data processing calculation is relatively complex; simultaneously, adjustable parameters are also greatly increased; the design is relatively flexible; and thus, relatively flexible and varied low-pass filters can be designed according to practical requirements.
Description
technical field [0001] The invention belongs to the technical field of filter design and manufacture, and relates to a novel low-pass filter design method based on transfer function and data processing. Background technique [0002] The filter has a very wide engineering application background, mainly used in signal processing, and its function is to eliminate some unwanted frequency signals in the signal through the design of filters of various types and performances. In particular, low-pass filters are more widely used, mainly used to reduce high-frequency noise interference, which can suppress high-frequency signals and pass low-frequency signals. Traditional low-pass filters are designed using linear system theory and transfer function concepts, and mainly use resistors and capacitors to form RC filter circuits. However, with the development of digital technology, traditional filters cannot flexibly adapt to actual needs and cannot meet the characteristics of different ...
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IPC IPC(8): H03H17/02
CPCH03H17/0248H03H2017/0072
Inventor 张友安雷军委鲍虎孙玉梅张吉松乔玉新吴华丽
Owner YANTAI NANSHAN UNIV