| 摘要 |
During shuttle mode operation in a system for the reproduction and storage of frequency separated video signals, the read head intersects a plurality of tracks corresponding to different fields of the image rather than following complete tracks. Accordingly, the full information for any one field is not recovered. To provide an image during shuttle mode, the system reads the dc luminance information of the tracks it intersects at the part where this information is stored. As the information content of the dc luminance information is relatively high, a recognisable image can be formed from this information alone. The dc luminance information is stored in the centre of the tracks with the other components arranged in order of increasing frequency towards the edge of the tape. The data which is most important to generation of a high quality image is stored in a place where it is less likely to be degraded. |
