| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a video tape recorder excellently reproducing an image when a failure occurs in main heads, and a video is recorded with sub-heads, even when the video recorded with the sub-heads is reproduced regularly with the main heads after the main heads are repaired, and in another device of the same head constitution. SOLUTION: The heads SP+, SP- are used as the main heads, and when the matter that the clogging, etc., occurs in them is detected by an envelope signal of an ENVDET 11b, the video is recorded with the heads EP+, EP-, and the video recording is continued. Then, when the heads are switched, a phase of a control signal recorded on a magnetic tape 7 is changed by 180 deg.. Thus, even when the video is reproduced regularly with the heads SP+, SP-, the image is reproduced excellently.</p> |
