The design parameters for a tape drive system depend greatly on its intended application. For a studio recorder they are: a) high degree of speed accuracy, b) low wow and flutter, c) little reaction to abruptly changing loads, d) multiple speed operation, e) synchronization to external equipment. To meet these requirements, Philips has developed the PRO '36 Studio Recorder utilizing a servo controlled tape drive system. In order to maintain state of the art design throughout, a solid state tape motion control system, modular electronics and glass bonded ferrite heads have also been incorporated. Thus far all attempts at an ideal tape drive system have fallen short of their goal, either in technical capability or economy. The tape drive system based on the induction motor, though inexpensive, has the drawback, among others, of being voltage dependent for speed regulation. The synchronis drive system, which has been the standard of the industry, suffers from the hysterisis effect even with improvements brought about by various drive couplings. The DC servo system overcomes these problems but is rather costly and has mainly been limited to instrumentation records.
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