The exact reproduction of a three-dimensional sound field is fundamentally impossible, so perfect stereophony cannot be realized. The success of any practical system must depend upon the degree to which it achieves an illusion of realism. Some physiological aspects of hearing and the means by which kinds of sound are identified are examined and demonstrated, to show the relative importance of intensity, phase, and transient effects in multichannel systems. The so-called -true- stereophonic is not so effective as artificially improved versions. The basic requirements for an economical stereophonic system using single-channel recording are deduced and demonstrated.
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