Abstract
A multichannel audio recorder/reproducer with a pulse-driven, digitally controlled, drive and control system differs radically in design from standard audio recorder/reproducer. The normal 3-phase synchronous motor is replaced with a pulse coincidence motor which will start or stop in less than 5 ms and thus offers new modes of control and interlock with either film cameras, projectors or videotape machines. The interface of the pulse coincidence principle is used in conjunction with film interlocking, automatic videotape editing and audio mixing facilities. Digital counters, coincidence circuits and comparators have been developed to provide automatic search and location presetting of prerecorded audio sequences as well as interface equipment such as Hall-effect heads.
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