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A Method for Qualifying Recorded Tone Bursts

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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JAES Volume 21 Issue 5 pp. 387-392; June 1973
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AES - Audio Engineering Society