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How to locate the zero time in a recorded, noisy waveform? How to quantify the extent of minimum‐phaseness of a waveform? And how to render a waveform or a seismic trace minimum phase? These are some of the questions with which we approached this paper which describes a new method for locating the time origin in a given waveform and, thereafter, factoring the waveform as a convolution of a causal minimum‐phase component and an anticausal maximum phase component.