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PROBLEM TO BE SOLVED: To make it possible to read tape information even though a servo lock is disengaged during a high speed running by controlling a relative speed between a magnetic tape and a rotation drum. SOLUTION: When a tape speed is a certain double speed in tape running, the fluctuation of...

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Bibliographische Detailangaben
1. Verfasser:	NAMIKATA YOSHIMICHI
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS REGULATING SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To make it possible to read tape information even though a servo lock is disengaged during a high speed running by controlling a relative speed between a magnetic tape and a rotation drum. SOLUTION: When a tape speed is a certain double speed in tape running, the fluctuation of the tape speed is monitored (S001); and if the tape speed decreases beyond an allowable range where data playback is considered possible, then a control is performed to lower the relative speed reference in response to the decrease in tape speed (S002). Here, the relative speed reference is lowered, that is, tape speed reference information and drum number of revolutions reference information are lowered and the relative speed between the magnetic tape and rotating drum can be kept almost constant.