Influence of window width selection in fault diagnosis of loudspeaker based on Short-time Fourier Transform

It is important that selects window function and width to Short-time Fourier Transform(STFT). Especially, when diagnosing fault loudspeaker, the different analysis window function and width can influent the result of analysis on respond signal of loudspeaker. So, it proposed a selecting analysis window function and width method based on the energy correction factor, the maximum side lobe and main lobe peak value in the frequency domain. Through reasonable selecting analysis window function and width, it can reduce the influence of truncation of signal caused by the Gibbs phenomenon and resolve the frequency resolution problem on STFT. Therefore, it can be more accurately to extract the fault feature of loudspeaker, and improve the loudspeaker on-line automatic fault detection accuracy.