Waveforms are not desirable as a perceptual representation of sound, even though they hold all the information we need to understand sound. The phase component of waveforms adds a dimension of complexity that is, to a large extent, filtered out by the ear/brain system. But, waveforms could be used if a uniquely mappable phase constraint could be applied. One possibility is to reconstruct the waveform using a minimum-phase constraint, i.e. all the poles and zeros are reflected to lie within the unit circle in the Z-plane. Such a representation has the advantage of being extremely sensitive to fine-scale temporal information in the signal. However, the order of time for which the waveform represents information is much below the threshold of human auditory perception.