Phase Shift Wavelet Coefficients
Wavelet coefficients are circularly shifted by the amount of phase shift induced by the wavelet transform.
phase.shift(z, wf, inv = FALSE) phase.shift.packet(z, wf, inv = FALSE)
z |
DWT object |
wf |
character string; wavelet filter used in DWT |
inv |
Boolean variable; if |
The center-of-energy argument of Hess-Nielsen and Wickerhauser (1996) is used to provide a flexible way to circularly shift wavelet coefficients regardless of the wavelet filter used. The results are not identical to those used by Percival and Walden (2000), but are more flexible.
phase.shift.packet is not yet implemented fully.
DWT (DWPT) object with coefficients circularly shifted.
B. Whitcher
Hess-Nielsen, N. and M. V. Wickerhauser (1996) Wavelets and time-frequency analysis, Proceedings of the IEEE, 84, No. 4, 523-540.
Percival, D. B. and A. T. Walden (2000) Wavelet Methods for Time Series Analysis, Cambridge University Press.
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