Study on the Features of Loudspeaker Sound Faults

In this paper, the short-time Fourier transformation (STFT) is adopted to transform the loudspeaker sound signal. By STFT, the one-dimensional loudspeaker response signal is converted into two-dimensional time-frequency figure. Then, the figure is decomposed into a number of areas according to its harmonics distribution. The peak and mean values of every area are computed. Through observation and calculation, the features of loudspeaker defects are found. According to the experiment, this method is very effective and universal for different types of loudspeakers.