Low cost digital autio recording/play back systems are developed by means of adapter style configuration combined with video tape recorders. The adapter works as a signal converter between audio signals, PCM signals and pseudo-video signals, and thus VTR's can be used without any modifications. Two kinds of systems are developed, for consumer use and for professional use. The former is based on home-use VTR's like Betamax, and the latter, on VTR's with performances equal to or better than U - matic systems. Their detailed structure, data configuration, and dropout compensation methods are presented.
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