# Translations:Two-length wavelets/7/en

Jump to navigation
Jump to search

which converges at every point inside the circle of radius . As a result, the coefficients represent the inverse, which is a stable causal filter. In particular, *H*(*Z*) converges on the unit circle, so the Fourier transform exists. For example, the stable causal inverse of (2, –1) is given by the coefficients in the expansion