| 摘要 |
A video tape signal recording/reproducing apparatus comprises two main rotary heads, M1, M2 and two sub-rotary heads, S1, S2 mounted on a rotatable disc 3. One main rotary head M1 has a +6 DEG azimuth angle and one sub-rotary head S1 has a -6 DEG azimuth angle and is mounted near the main rotary head M1. The other main rotary head M2 has a -6 DEG azimuth angle and the other sub-rotary head S2 has a +6 DEG azimuth angle. The distances between each of the main rotary heads M1, M2 and the corresponding sub-rotary heads S1, S2 are the same and may for example correspond to two horizontal sync intervals.
<??>In the fast motion reproduction mode, the main rotary head M1 and the sub-rotary head S1 scan recorded video tracks on the video tape, as a result of which the reproduced signal from the main rotary head M1 includes a number of portions of lower signal level in one field. Similarly, the reproduced signal from the sub-rotary head S1 has a number of such lower signal level portions having opposite phase to that of the main rotary head M1. The reproduced signal from the sub-rotary head S1 compensates for the lower signal level portions of the reproduced signal from the main rotary head M1. Therefore the picture reproduced in the fast motion reproduction mode has no noise bar. In the same manner, the picture has no noise bar in the fast reverse motion mode, the slow motion mode or the still mode.
<??>As an alternative, the azimuth angles of associated main and sub-rotary heads can be the same, but the planes of rotation of the main and sub-rotary heads are spaced by an odd number of track pitches. |
