In the quest for more and more faithful reproduction by electro-acoustic means, after all the possibilities afforded by single-channel transmission have been exhausted, substantial improvements can only be achieved by multi-channel stereophonic transmission. A few of the factors that play a part in this type of sound transmission have been known for about 30 years. Some of these, however, can only be understood and correctly reformulated in the light of recent discoveries in the physiology of hearing, and a number of questions still remain to be answered. In considering the practical means employed for stereophonic transmission, it seems that development hitherto has not led to a single optimum, but to a number of solutions of apparently equal value. In this article, after a summary of the most important principles, a survey will be attempted of proven methods of transmission, and a few examples of their application will be given.
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