手法を比較

	シンクロスクイージング変換	ウェーブレットコヒーレンス
分野	時系列解析	時系列解析
系統	Process / pipeline	Process / pipeline
提唱年	2011	1999
提唱者	Ingrid Daubechies	Christopher Torrence
種類	Time-frequency decomposition	Multi-scale correlation and phase
原典	Daubechies, I., Lu, J., & Wu, H. T. (2011). Synchrosqueezed wavelet transforms: An empirical tool for time-frequency analysis. Applied and Computational Harmonic Analysis, 30(2), 243–261.	Torrence, C., & Webster, P. J. (1999). Interdecadal changes in the ENSO–monsoon system. Journal of Climate, 12(8), 2679–2690.
別名	SST, Synchrosqueezing	WTC, Wavelet coherency, Continuous wavelet coherence
関連	3	1
概要	The synchrosqueezing transform is a time-frequency reassignment technique that sharpens the output of the continuous wavelet transform by concentrating energy along instantaneous frequency ridges. Introduced by Ingrid Daubechies and colleagues in 2011, it addresses the fundamental limitation of the standard wavelet transform: poor frequency localization. This method is particularly valuable for analyzing signals with time-varying frequency content.	Wavelet coherence (WTC) is a normalized measure of correlation between two time series in the time-frequency domain, eliminating the amplitude-dependence of the raw cross-wavelet transform. Introduced by Torrence and Webster (1999) and formalized by Grinsted, Moore, and Jevrejeva (2004), WTC quantifies how tightly two signals are coupled at each time-frequency point, independent of their individual power levels. It is the wavelet analog of classical spectral coherence, revealing time-localized relationships across all frequencies.