Enforcing minimum phase on nonstationary filters

Michael P. Lamoureux, Gary F. Margrave

We discuss designing nonstationary filters that preserve the minimum phase property: minimum phase signals in, must produce minimum phase signals out. Such filters are important in deconvolution: by accurately representing the physics of wave propagation through the earth, one aims to build algorithms that give better seismic images. These filters model the observed physical phenomena that the minimum phase property of an impulsive source is preserved even as it passes through an attenuating, dispersive medium.