Transmission line audible noise multi-channel signal extraction method

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.