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Method for recording and/or reproducing video and audio signals on a magnetic tape and a rotary cylinder arrangement therefor
| Details |
Inventors: Higurashi, Seiji;
Assignee: Victor Company of Japan, Ltd. (JP)
Primary Examiner: Faber; Alan
Assistant Examiner:
Attorney, Agent or Firm: Lowe, Price, LeBlanc, Becker & Shur
Both an audio signal and a video signal are recorded on a video tape (3) by way of a pair of audio heads (Ha1, Ha2) and a pair of video heads (Hv3, Hv4) both mounted on a rotary cylinder (1) of a video tape recorder of helical scan type which can be operated in a standard-time mode and a long-time mode. In the long-time mode, audio tracks (8, 8', 8") are formed successively without having guard bands therebetween, and video tracks (7, 7') are formed upon the audio tracks with guard bands therebetween such that boundaries (L1, L2) between consecutive audio tracks (8, 8', 8") are covered by video track (7, 7'). The audio and video heads are positioned such that the audio heads are advanced by a given angle (T+.theta.) from the video heads in a direction of the rotation of the cylinder, and the distance (X') between the bottom of the audio heads and the bottom of the video heads is determined as a function of a track pitch (P.sub.2), the angular displacement (T+.theta.) between the video and audio heads, and a desired difference (B) between edges of audio and video tracks to be formed in long-time mode. Two other video heads (Hv1, Hv2), which may be used for only the standard-time mode, may also be provided in addition to the above-mentioned video heads. |
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DETAILED DESCRIPTION The present invention has been developed in order to remove the above-described drawbacks inherent to the conventional and preproposed methods of recording video and audio signals on a magnetic tape.
It is, therefore, an object of the present invention to provide new and useful method for recording and/or reproducing video and audio signals on a magnetic tape by way of helical scan rotary cylinder so that both video and audio signals are recorded at high density and reproduced with satisfactory S/N without suffering from crosstalk between adjacent tracks.
According to a feature of the present invention audio tracks are formed successively without having guard bands therebetween in long-time mode, and video tracks are formed upon the audio tracks with guard bands therebetween such that boundaries between consecutive audio tracks are covered by video tracks.
In order to achieve such method of recording, a pair of video heads and a pair of audio heads are provided to a rotary cylinder so that the audio heads are advanced by a given angle from the video heads in a direction of the rotation of the cylinder, and the distance from the bottom of the audio heads to the bottom of the video heads is determined as a function of a track pitch and the angular discplacement between the video and audio heads.
In accordance with the present invention there is provided a method of recording a video signal and an audio signal on a magnetic tape by way of rotary heads, comprising the steps of: forming two audio tracks on said tape such that there is no guard band between said audio tracks; and forming a video track after said audio tracks are formed upon said audio tracks such that a boundary between said audio tracks is covered by said video track.
In accordance with the present invention there is also provided a method of recording and reproducing a video signal and an audio signal on and from a magnetic tape by way of rotary heads, comprising the steps of: forming two audio tracks on said tape such that there is no guard band between said audio tracks; forming a video track after said audio tracks are formed upon said audio tracks such that a boundary between said audio tracks is covered by said video track; and scanning said audio tracks and said video track so as to pickup audio and video signals respectively
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