| 摘要 |
A video signal recording apparatus of reduced size for portability combines a video camera and helical scan video tape recorder in a single unit, in which the reduced size is obtained in part by having a tape guide drum of reduced diameter, which requires a tape wrap angle greater than the conventional 180 DEG and employs a pair of rotary tape heads that are arranged close together relative to the diametrically opposed conventional head arrangement. The timing of the heads in recording the fields of the video signals as tracks is controlled by a vertical synchronization signal having pulses that are delayed to account for the finite distance between the two rotary heads. The vertical sync signal then has a different time period for a first field than it does for a second field of one frame of the video signal. The camera has an image pickup portion that is caused to be scanned by the same synchronization signals utilized in the recording operation. This permits any horizontal overscan to occur at a time when the heads are off the tape and by adjusting the time base of the vertical sync signal the overscan can be arranged so that the portion of it is above and below the effective portion of the image pickup portion of the camera. |
