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Undistorted signal processing method, storage medium and system based on overlapping windowing

A signal processing and overlapping windowing technology, applied in the field of signal processing, can solve problems such as data signal distortion

Active Publication Date: 2021-04-23
NAT UNIV OF DEFENSE TECH
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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, storage medium and system based on overlapping windowing
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  • Undistorted signal processing method, storage medium and system based on overlapping windowing

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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, the overlapping part of the superimposed distortion-free window function is a constant, and in order to keep the gain of the signal after passing through the filter, 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 wi...

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Abstract

The present invention provides a kind of distortion-free signal processing method based on overlapping and windowing, comprising: step 1, dividing the data signal to be processed into the first data signal and the second data signal; step 2, using the original window function Windowing the first data signal; step 3, obtaining a complementary window function according to the original window function and a preset overlapping scale factor; step 4, performing delay processing on the complementary window function and the second data signal respectively; step 5. Use the complementary window function after delay processing to window the second data signal after delay processing; Step 6. Add the first data signal and the second data signal after windowing to obtain a distortion-free signal . The invention also provides a storage medium and system. The present invention reduces the amount of calculation while ensuring a certain overlapping ratio, and at the same time avoids the problem of distortion of data signals in the process of windowing.

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 Patents(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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