“…The state-variable formulation of the deconvolution problem (also called the input white-noise estimation problem) and its several solutions suggested in [I-S] are very elegant and should be very useful whenever sufficient information is available about the nature of the seismic wavelet to warrant such modelling. The adaptive, tim~-varying op!rators either in the tapped-delay line or the !attic~ filter forms suggested in [6][7][8][9][10], on the other hand, are likely to prove effective on nonstationary seismic data as from offshore experiments.…”