The historical development of mathematical transformations in audio systems analysis is examined as the changes in sound recording practice and the consequent insight into the operation of the ears are described. The progress in the formal modeling of the audio transformations which the ears seem to perform on sound appears to have reached a theoretical limit in information which may be derived from a set of single point pressure intercepts. Principles of optical interferometry are examined broadly as a possible basis for new acoustical intercepts which will provide more information about acoustic phenomena for audio analysis. New audio transformations developed from experience with acoustical transducers operating onoptical principles may lead to important discoveries about the operation of the ear, which in turn may improve the audio illusion well beyond present standards.
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