Page 364 - Acquisition and Processing of Marine Seismic Data

6.8 SHAPING FILTERS 355

FIG. 6.40 An application of dephasing. (A) A minimum phase stack section, and (B) its zero phase conversion.

FIG. 6.41 Flow of the processing steps to obtain minimum phase wavelet for signature processing.

are doubled while negative time amplitudes are Fourier transform (Fig. 6.41). Fig. 6.42 shows
zeroed out (Yılmaz, 1987). In the frequency an example application of designature to a
domain, the exponential of the spectrum is cal- shot gather. In this example, designature also
culated and the minimum phase wavelet is converts input seismograms into zero phase
obtained in the time domain after an inverse equivalents.