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http://dx.doi.org/10.7471/ikeee.2019.23.3.893

Sound Signal Analysis Using the Time-Frequency Representations  

Iem, Byeong-Gwan (Dept. of Electronic Eng., Gangneung-Wonju Nat. Univ.)
Publication Information
Journal of IKEEE / v.23, no.3, 2019 , pp. 893-898 More about this Journal
Abstract
Time-frequency representations are methods to display the magnitude or energy density of a signal on the two dimensional plane of both time and frequency. They are useful in analyzing the characteristics of time-varying signals. Music is a typical time-varying signal, and it can be analyzed by time-frequency representations. Recently, it is popular to change the sound quality by attaching a safety sounder to an instrument. It is performed to improve perception subjectively by spending little cost and modifying sound quality. In time domain, it is difficult to notify the difference between music signals with and without the sounder. But, it is easy to find the difference in frequency domain or in time-frequency domain. In this paper, the music signal from a flute with sounder is analyzed both in the frequency domain and in the time-frequency domain. It is confirmed that the frequency components in the mid-frequency range of 500~2500 are reinforced.
Keywords
time-frequency representation; sounder; music signal; Fourier transform; time-varying signals;
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