The concept of the S-method is a combination between the STFT and the Pseudo Wigner Distribution (PWD), the windowed version of the WD.
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- The concept of the S-method is a combination between the STFT and the Pseudo Wigner Distribution (PWD), the windowed version of the WD. Wigner distribution <math> W_x(t,f)=\int_{-\infty}^{\infty}x(t+\tau/2)x^*(t-\tau/2)e^{-j2\pi\tau\,f}d\tau</math> Pseudo Wigner distribution <math> W_x(t,f)=\int_{-\infty}^{\infty}w(\tau/2)w^*(-\tau/2)x(t+\tau/2)x^*(t-\tau/2)e^{-j2\pi\tau\,f}d\tau</math> S-method <math> SM(t,f)=\int_{-\infty}^{\infty}P(\theta)Y(t,f+\theta/2)Y^*(t,f-\theta/2)d\theta </math> <math> where\ Y(t,f)=\int_{-\infty}^{\infty}w(\tau)x(t+\tau)e^{-j2\pi f\tau}d\tau\ Is\ the\ STFT\ </math> <math>P(\theta)</math> Is a windowing function in the frequency domain resulting in the cross term removal.
- 改進型韋格納分佈(modified Wigner distribution function),用於時頻分析的一種方法,屬於信號處理的範疇。它改進了韋格納分佈原有的相交項(cross term)的問題。韋格納分佈是西元1932年由耶諾·帕爾·維格納(Eugene Wigner)所提出用於古典力學,但是亦可用於時頻分析。韋格納分佈與短時傅立葉轉換都可用於時頻分析,雖然前者通常擁有較高的解析度且有良好的數學特性,但當有兩個以上的信號成分時,韋格納分佈就會出現相交項問題,這在應用上造成很大的困擾。因此在西元1995年,L. J. Stankovic和S. Stankovic提出了改進型韋格納分佈,以修正韋格納分佈中會出現的相交項問題。
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- The concept of the S-method is a combination between the STFT and the Pseudo Wigner Distribution (PWD), the windowed version of the WD.
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- Modified Wigner distribution function
- 改進型韋格納分佈
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