Automatic head tracking system

  • Inventors:
  • Assignees: Sony Corp
  • Publication Date: November 26, 1980
  • Publication Number: GB-1580008-A


During the reproduction of signals, a magnetic head (1) is moved along the recording track. An electrically deflectable securing means (2) for the magnetic head is fed an electric signal for deflecting the magnetic head. The deflecting signal is generated in a deflecting-signal generator (11, 12) according to the deflection of the magnetic head with respect to a position of rest. An envelope detector (5) serves for detecting the envelope of the signal which is emitted by the magnetic head. With a multiplying circuit (22), the detected envelope is demodulated synchronously with the deflecting signal, in order to obtain from it the tracking-error signal, which represents the deflection from the position of rest. In the adding circuit (8), the tracking-error signal and the deflecting signal are added. <IMAGE>




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Cited By (8)

    Publication numberPublication dateAssigneeTitle
    EP-0066996-A1December 15, 1982Sony CorporationSpurfolgevorrichtungen für Video-Bandgeräte
    EP-0279132-A1August 24, 1988Schlumberger IndustriesDevice for detecting the position of a plurality of magnetic heads
    EP-0372481-A2June 13, 1990Mitsubishi Denki Kabushiki KaishaMagnetisches Aufzeichnungs-/Wiedergabegerät
    EP-0372481-A3July 03, 1991Mitsubishi Denki Kabushiki KaishaMagnetic recording and reproducing apparatus
    FR-2608825-A1June 24, 1988EnertecDispositif pour la detection de la position d'une tete magnetique
    US-4910615-AMarch 20, 1990Schlumberger IndustriesCapacitance sensor for detecting the position of magnetic rotating heads
    US-4918546-AApril 17, 1990Sony CorporationTracking control devices for video tape recorders
    US-5157563-AOctober 20, 1992Mitsubishi Denki Kabushiki KaishaMagnetic recording and reproducing apparatus using an electromagnetic actuator for automatic tracking