A multi-channel signal extraction method for audible noise in transmission lines
A transmission line and signal extraction technology, applied in the direction of noise figure or signal-to-noise ratio measurement, etc., can solve problems such as the difficulty of accurate measurement of audible noise, achieve good noise cancellation and source strength extraction effects, avoid damage, and eliminate a large amount of noise Effect
Active Publication Date: 2018-03-13
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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[0007] The purpose of the present invention is to solve the problem that it is difficult to accurately measure the audible noise of the high-voltage transmission line. The present invention proposes a multi-channel signal extraction method for the audible noise of the transmission line
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[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementation steps.
[0030] In this embodiment, a multi-channel signal extraction method for audible noise of a power transmission line includes the following steps:
[0031] (1) Perform framing and windowing processing on multi-channel noisy signals;
[0032] (2) Using wavelet packet decomposition technology for signal denoising;
[0033] (3) Calculating the energy statistical distribution characteristic parameter of listening noise to the multi-channel signal, and obtaining the power density spectrum;
[0034] (4) Inversely transform the power density spectrum to obtain the audible noise signal of the transmission line.
[0035] In this embodiment, the M channel signal x of the current frame i (t), (i=1,2,...M) do windowing processing, the window function can be a rectangular window or a hamming window; the frame length selection range is 1-1.5 secon...
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The invention discloses a transmission line audible noise multi-channel signal extraction method. The method comprises the steps that (1) framing and windowing are carried out on a multi-channel noisy signal; (2) a wavelet packet decomposing technology is used to carry out signal de-noising; (3) audible noise energy statistical distribution characteristic parameters are calculated for the multi-channel signal, and a power density spectrum is acquired; and (4) inverse transforming is carried out on the power density spectrum to acquire an audible noise signal of a transmission line. According to the invention, an energy statistical distribution characteristic method of wavelet packet decomposing de-noising and singular value decomposing is used; a lot of noise is eliminated; source strength signal is prevented from damage as much as possible; the method has great effects of noise cancellation and source strength extraction; the method is used for extracting the sound source signal of the transmission line, and can be widely used for source strength filtering in a noisy environment.
Description
technical field [0001] The invention relates to a multi-channel signal extraction method for audible noise of transmission lines, which belongs to the technical field of noise. Background technique [0002] In order to meet the needs of electricity consumption for sustainable economic and social development, the scale of power grid construction has been continuously expanded, and the voltage level has been continuously improved. High-voltage power transmission has become a necessary measure for urban operation. The audible noise generated during the operation of the transmission line is a kind of noise that can be directly heard by the human ear produced by the corona discharge on the surface of the wire. It has almost no pure tone part and is all broadband noise. This noise may annoy and disturb residents or workers near the transmission line. As the voltage level continues to rise, the audible noise generated by corona discharge becomes more and more obvious, and the impa...
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IPC IPC(8): G01R29/26
Inventor 伍发元徐锐蔡俊梅重民方铭刘平
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST