IFFT
gtsThe IFFT
function computes an Inverse Fast Fourier Transform of two Geo Time Series™
representing real and imaginary parts of FFT coefficients.
The result is the reconstructed Geo Time Series™. The ticks of this reconstructed GTS are the coefficient indices. They must be multipled by the original
bucketspan to space the ticks according to the decomposed Geo Time Series™. The bucketspan is equal to X / (n * factor)
where X
is the number of time
units in a second, n
is the number of coefficients and factor
is the scale factor returned by FFT
.