Process for controlling the capstan in a video tape recorder (VTR)
AssigneeThomson Licensing
InventorKwong Heng Kwok
Life of this patent
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Abstract
In a video tape recorder (VTR), the capstan draws the tape from which the video signal is reproduced in a forward direction. The following steps are used to control the capstan, applying a torque to the capstan in a backward direction for a first predetermined period of time. Applying a torque to the capstan in the forward direction for a second predetermined period of time and nullifying the motor current. This arrangement is particularly convenient for slow-motion and still-picture modes.
Claims6
A method for controlling a capstan in a video tape recorder, the capstan being driven by a motor and drawing a tape from which a video signal is reproduced, including the following successive steps:
- rotating the capstan in a first direction;
- applying a torque to the capstan in a second direction opposite the first direction for a first predetermined period of time;
- applying a torque to the capstan in the first direction for a second predetermined period of time;
- nullifying the motor current, wherein:
- during the first and second periods of time the control current is strictly positive;
- during the first period of time the control rotation direction is set backward;
- and,
- during the second period of time the control rotation direction is set forward.
Dependencies are inferred from the claim text.