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Second-order IIR digital notch filter and parameter quantization method

A quantization method and notch filter technology, applied in digital technology networks, impedance networks, adaptive networks, etc., can solve the problems of widening bandwidth and raising noise, reducing quantization noise, preventing the noise floor from being raised, and reducing The effect of resource consumption

Active Publication Date: 2018-09-21
北京北方联星科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pole-zero offset will cause some noise to be raised, and the bandwidth of the 3DB notch will be widened

Method used

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  • Second-order IIR digital notch filter and parameter quantization method
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Embodiment Construction

[0044] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] Such as figure 1 Shown is the structure diagram of the direct type II IIR digital trap implemented by the present invention. The structure of the notch filter includes but not limited to direct type I implementation, direct type II implementation, and transposed direct type II implementation.

[0046] A second-order IIR digital notch filter, characterized in that, the transfer function of the second-order IIR digital notch filter is Among them, b0, b1, b2, a1, a2 are the quantization parameters of the second-order IIR filter difference equation of the causally stable LTI linear time-invariant system, and r and w0 are the second-order IIR traps of the causally stable LTI linear time-invariant system, respectively. The polar radius and polar angle of the poles of the oscilloscope differential equation.

[0047] Among them, the quantiza...

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Abstract

A second-order IIR digital notch filter and a parameter quantization method proposed by the invention may realize the suppression of the full-band narrow-band interference by parameter configuration,reduce the zero-pole polar angle deviation, and realize the perfect zero-pole matching of the full-band notch filter and the flatness of pass-band filtering performance by less resource consumption. The transfer function of the second-order IIR digital notch filter is FORMULA referred as follows, wherein b0, b1, b2, a1, and a2 are quantization parameters of a second-order IIR filter difference equation of a causally stable LTI linear time invariant system, and r and w0 are polar diameter and polar angle of the pole of the second-order IIR notch filter difference equation for the causally stable LTI linear time invariant system.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, in particular to a second-order IIR digital notch filter and a parameter quantization method. Background technique [0002] In the narrowband interference suppression technology, when the interference frequency point and bandwidth are known, using a digital second-order IIR notch filter in the time domain is a simple and convenient method to suppress interference. For example, the patent "CN201210066885.6-Complete Adaptive Notch Filter and Notch Method for Satellite Navigation System" proposes a second-order lattice IIR filter. The patent "CN201210193530.3-two-dimensional adaptive filter narrowband interference suppression device" proposes a two-dimensional multi-order IIR filter. The patent "CN201210434766.1-GNSS Receiver Detects and Eliminates Narrowband Interference Method" also proposes a method of finding interference frequency points in the frequency domain and suppressin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/04H03H21/00
CPCH03H17/04H03H21/0012H03H2017/009
Inventor 不公告发明人
Owner 北京北方联星科技有限公司
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