Процедура DIPFILT.
Рекурсивная фильтрация по наклонам.
Параметры
mode
0 = high dip reject
1 = low dip reject
rho
dip-cutoff (3db point) in samples/trace (float) (*1000)
freq
frequency in cycles/sample at which a dip of rho
is attenuated by 3db (Nyquist
= .5) (float)
Алгоритм см.
http://sepwww.stanford.edu/sep/prof/iei/txz/paper_html