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    • 48. 发明专利
    • IC FOR SENSOR DETECTION IN DAT
    • AU639251B2
    • 1993-07-22
    • AU6115390
    • 1990-08-21
    • SONY CORPORATION
    • SHINICHI FUKUDA
    • G11B15/467
    • An integrated circuit (2) includes a drum phase detection signal generating unit (2A) formed by two-stage amplifiers (20, 21) and a comparator (22), a drum frequency detection signal generating unit (2B) similarly formed by two-stage amplifiers (23, 24) and a comparator (25), a capstan frequency detection signal generating unit (2C), a supply reel frequency detection signal generating unit (2D) and a take-up frequency detection signal generating unit (2E) each formed by a comparator (26 to 27). From respective associated voltage sources a predetermined voltage is applied to each of the first stage amplifiers (20, 23), second stage amplifiers (21, 24), and comparators (22, 25 to 28) of the drum phase detection signal generating unit (2A), the drum frequency detection signal generating unit (2B), the capstan frequency detection signal generating unit (2C), the supply reel frequency detection signal generating unit (2D), and the take-up reel frequency detection signal generating unit (2E).