| 摘要 |
A video tape recorder has a simple helical-scan construction capable of variable-speed reproduction free from noise bars on reproduced images at desired speeds ranging from a normal speed in reverse reproduction to threefold normal speed in forward reproduction. The video tape recorder comprises a magnetic tape drive mechanism including a capstan motor and a pinch roller for driving a magnetic tape, a control circuit for moving the magnetic tape at constant speeds including a normal speed, a twofold speed, a threefold speed in forward reproduction and a normal speed in reverse reproduction, and for keeping the magnetic tape stationary, a speed setting circuit for setting any one of the foregoing speeds as a tape running speed, a control signal reproducing circuit for reproducing control signals recorded on the magnetic tape at one-frame intervals, a control signal selection circuit for selecting a control signal dependent on a speed setting from the reproduced control signals, a time setting circuit for varying a time setting starting from a control signal selected by the control signal selection means, and a speed changing circuit for changing the normal speed in reverse reproduction, the stationary, the normal speed, the twofold normal speed, and the threefold normal speed in a time interval of a few frames.
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