Automatic scan tracking using a magnetic head supported by a piezoelectric bender element
Tracking control system
Controlling the trace of a rotary head
Scan tracking apparatus for helical scan video tape recorder Patent #: 4520410
ApplicationNo. 06/596710 filed on 04/04/1984
US Classes:386/79, Using control signal on the recording medium360/70, Synchronizing moving-head moving-record recorders360/77.16, Having head deflection drive (e.g., piezoelectric bimorph)386/113, Recorder or reproducer fault condition compensation386/77Having static memory
ExaminersPrimary: Cardillo, Raymond F. Jr.
Assistant: Nguyen, Hiep T.
Attorney, Agent or Firm
International ClassG11B 5/588 (20060101)
Foreign Application Priority Data1983-04-04 JP
AbstractA scan tracking circuit for helical scan video tape recorders. The circuit creates and combines three control signals and generates as an output a deflection signal which serves to accurately maintain the scanning head on a desired track. The first control signal is sawtooth shaped and is based upon and derived from the speed of the tape. The second control signal is dependent on the signal which is developed by the scanning head and is also correlated with other signals which are obtained from previous scans of a previous scanned video track. The third signal is selected from a plurality of stored signals each of which is tailored to correct for a characteristic curvature pattern associated with video tracks produced by a particular VTR machine. The final deflection signal is a composite of the three control signals.
Field of SearchSynchronizing moving-head moving-record recorders