A circuit philosophy is described for qualifying properly recorded tone bursts on tape recordings. More specifically, these bursts, recorded on a control track accompanying audio materials, are used to synchronize various events in a low-cost audio visual machine. The circuit checks three important parameters of each burst; amplitude, duration, and frequency, and displays the total of all correct bursts. A block diagram and design philosophy are covered.
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https://aes2.org/publications/elibrary-page/?id=1963
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