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Design method and device of filter for suppressing narrow-band interference
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A technology of narrow-band interference and design method, applied in the direction of electrical components, impedance network, etc., can solve the problems of complex structure and slow running speed.
Active Publication Date: 2020-06-05
北京数码视讯软件技术发展有限公司
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[0003]
However, when the complex limited wave IIR filter is used to filter out interference, the structure of the traditional complex limited wave IIR filter is relatively complicated and the operation speed is slow
Method used
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Embodiment 1
[0058] figure 2 It is a flowchart of a design method of a filter for suppressing narrowband interference provided by Embodiment 1 of the present invention.
[0059] refer to figure 2 , the method includes the following steps:
[0060] Step S101, obtaining a preset interference frequency and a preset suppression bandwidth;
[0061] Step S102, setting constraint conditions according to a preset interference frequency and a preset suppression bandwidth;
[0062] In this application, different constraints can be set, including formula (11) in addition to formula (8), formula (9) and formula (10).
[0063]
[0064] Refer to Table 1 for different constraints:
[0065]
[0066] Among them, method 1, method 2 and method 3 are all 2M+1 constraints, and method 4 is 3M+1 constraints. In addition, formula (6) is an overdetermined equation group, which is expressed in matrix form, specifically refer to formula (12):
[0067] Ga=P (12)
[0068] in,
[0069]
[0070]
[0...
Embodiment 2
[0120] Figure 5 It is a schematic diagram of a device for designing a filter for suppressing narrow-band interference provided in Embodiment 2 of the present invention.
[0121] refer to Figure 5 , the device consists of:
[0122] An acquisition unit 1, configured to acquire a preset interference frequency and a preset suppression bandwidth;
[0123] A setting unit 2, configured to set constraint conditions according to a preset interference frequency and a preset suppression bandwidth;
[0124] The first calculation unit 3 is used to calculate the coefficients of the M-order complex all-pass filter according to the constraints;
[0125] The second acquisition unit 4 is used to obtain the transfer function of the M-order complex all-pass filter according to the coefficient of the M-order complex all-pass filter, and M is a positive integer;
[0126] The third acquisition unit 5 is used to obtain the transfer function of the M-order complex wave-limiting IIR filter accord...
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Abstract
The invention provides a design method and device of a filter for suppressing narrowband interference. The method comprises the following steps: acquiring a preset interference frequency and a presetsuppression bandwidth; setting a constraint condition according to the preset interference frequency and the preset suppression bandwidth; calculating the coefficient of an M-order complex all-pass filter according to the constraint condition; obtaining a transfer function of the M-order complex all-pass filter according to the coefficient of the M-order complex all-pass filter; obtaining a transfer function of an M-order complex limited wave IIR filter according to the transfer function of the M-order complex all-pass filter; obtaining transfer functions of M cascaded first-order filters according to the transfer functions of the M-order complex limit wave IIR filter. The transfer function of the M-order complex limit wave IIR filter is expressed in the form of a zero pole. The design structure of the M-order complex limit wave IIR filter is simple, and the operation speed of the M-order complex limit wave IIR filter is high.
Description
technical field [0001] The invention relates to the technical field of digital signalprocessing, in particular to a design method and device for a filter for suppressing narrow-band interference. Background technique [0002] In the application of digital communication system or digital signalprocessing, other frequencies of useful signals are retained by filtering out the interference of narrowband signals or sinusoidal signals. At present, wave-limiting filters are used to filter out interference. The wave-limiting filter is divided into a real wave-limiting filter and a complex wave-limiting filter according to the real signal and the complex signal. According to the length of the impulse response of the filter, it is divided into an FIR (Finite Impulse Response, finite impulse response) filter and a complex limited wave IIR (Infinite Impulse Response, infinite impulse response) filter. Since the order of the FIR filter is more than that of the complex wave-limited II...
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