A practical method of computation is described for making periodic signals V(t) which have a given frequency spectrum and which minimize the variance 〈(V2−〈V〉2)2〉 in power as a function of time. These signals can be used to measure the spectral response of a system (the transfer function): They represent a significant improvement over traditional random-phase and minimum peak value approaches. The signals are also of psychophysical interest.
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Jon Pumplin (1985) studied this question.