Undistorted signal processing method and system based on superposed window, and storage medium

A signal processing and overlapping windowing technology, applied in the field of signal processing, can solve problems such as data signal distortion, and achieve the effect of avoiding distortion, solving signal distortion, and reducing the amount of calculation.

Active Publication Date: 2021-03-26
NAT UNIV OF DEFENSE TECH
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  • Application Information

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Problems solved by technology

However, the overlapping window function is not stable in the passband, which leads to distortion of the data signal during the windowing process.

Method used

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  • Undistorted signal processing method and system based on superposed window, and storage medium
  • Undistorted signal processing method and system based on superposed window, and storage medium
  • Undistorted signal processing method and system based on superposed window, and storage medium

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Embodiment Construction

[0044] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] The design principle of this embodiment: in order to obtain the distortion-free window function, that is, to make the overlapping part of the superimposed distortion-free window function constant, in order to keep the gain of the signal after the filter unchanged, the constant is set to 1, according to It can be obtained that the complementary window function for overlapping is designed from the original known window function, and the complementary window function is delayed by 1 / 2 and added to the original window function to obtain the undistorted window function. Refer to figure 2 , whose expression is as follows:

[0046]

[0047] in, w add ( n ) is the distortion-free window function, w ( n ) is the original window function, N is the number of discrete signal points, k is the number of overlapping window fu...

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Abstract

The invention provides an undistorted signal processing method based on a superposed window. The undistorted signal processing method comprises the following steps: step 1, dividing a to-be-processeddata signal into a first path of data signal and a second path of data signal; 2, windowing the first path of data signal by adopting an original window function; 3, obtaining a complementary window function according to the original window function and a preset overlapping scale factor; 4, respectively carrying out delay processing on the complementary window function and the second path of datasignal; 5, windowing the second path of data signal after delay processing by adopting the complementary window function after delay processing; and 6, adding the windowed first path of data signal and second path of data signal to obtain an undistorted signal. The invention further provides a storage medium and a system. According to the invention, under the condition that a certain overlapping ratio is guaranteed, the calculated amount is reduced, and meanwhile the distortion problem of data signals in the windowing process is avoided.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a distortion-free signal processing method, storage medium and system based on overlapping and windowing. Background technique [0002] From the perspective of the time domain, windowing is essentially weighting the input signal (windowing in this design refers to adding a non-rectangular window). The purpose of small spectral leakage. The purpose of windowing is to accurately estimate the signal spectrum, but windowing will also cause distortion of the input signal, resulting in additional loss of signal-to-noise ratio. [0003] In view of the SNR loss caused by windowing, the measure of overlapping and windowing data is usually used to compensate for the loss caused by windowing. In general (except for rectangular windows), the larger the overlap ratio, the smaller the windowing loss, but the amount of calculation increases as the overlap ratio increases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
CPCH04L25/03828
Inventor 李湘豪鲁祖坤陈飞强孙一凡谢郁辰郭海玉任彬彬宋捷王晓琴杨威
Owner NAT UNIV OF DEFENSE TECH
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