Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1998-06-04
2001-07-17
Garber, Wendy R. (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000, C386S349000, C360S064000
Reexamination Certificate
active
06263151
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a system construction and so on for realizing a long play recording/reproducing system such as a recording/reproducing apparatus and a reproducing apparatus.
Conventionally, for example, in VHS standard magnetic recording/reproducing apparatuses or video tape recorders (VTR), there has been realized a long play recording mode of a triple mode in which a magnetic tape runs at a speed equal to ⅓ of a standard tape running speed. These techniques have been disclosed by, for example, JP-A-59-124004 and so on. Also, various data input means using a control signal on a magnetic tape include techniques disclosed by, for example, JP-A-62-33388 and so on. Further, high-speed fast feed/rewind techniques have been disclosed by, for example, JP-A-1-217752.
SUMMARY OF THE INVENTION
There are very strong demands for long play recording and longer play recording apparatuses are desired. However, it is necessary to realize a reasonable system while maintaining the compatibility with the conventional standard play recording mode. Therefore, an object of the present invention is to realize a long play recording mode while following the conventional system while solving problems inclusive of the construction of rotary audio and video heads, a control method for automatic tracking and a control technique at the time of high-speed fast feed/rewind which newly arise in realizing the long play mode.
To attain the above object, the present invention provides a recording/reproducing apparatus of a helical scan system for recording a video signal and an audio signal in a superimposed manner on a magnetic tape by use of magnetic head means mounted on a rotary body or reproducing such recorded signals by use of the magnetic head means, characterized in that the magnetic head means includes first and second video heads for recording or reproducing a video signal at the time of standard play mode in which the running speed of the magnetic tape is a standard speed, third and fourth video heads for recording or reproducing a video signal at the time of N-ple play mode in which the tape running speed is approximately 1/N of the standard speed wherein N is an integer not smaller than 4, and first and second audio heads for recording or reproducing an audio signal, the video and audio heads being provided on the outer periphery of the rotary body, that the first and second video heads, the third and fourth video heads, and the first and second audio heads are respectively provided in pairs so that the heads in each pair are arranged at positions which are substantially symmetrical with respect to a rotation axis of the rotary body, the gap planes of the paired heads being tilted relative to a plane perpendicular to a head rotation direction by equal angles in different directions, and the tilt angles of the first and second audio heads being different from the tilt angles of the first and second video heads and the third and fourth video heads, and that the recording is performed so that the first and second video heads or the third and fourth video heads record a video signal in a superimposed manner on a track having an audio signal recorded on the magnetic tape by the first and second audio heads.
Also, it is characterized in that the first and fourth video heads having their gap planes with different titling directions are arranged in proximity to each other to form one pair while the second and third video heads having their gap planes with different titling directions are arranged in proximity to each other to form one pair, these pairs being respectively arranged rearward of the arranging positions of said first and second audio heads by approximately 120 degree along the head rotation direction so that the heights of the centers of the head widths of these video heads measured from a reference surface of the body substantially coincide with each other.
In this case, it is preferable that the head width of each of the first and second audio heads is not larger than three times as large as a track pitch formed on the magnetic tape at the time of N-ple play mode. There can be provided automatic tracking means for performing a tracking control by use of a signal reproduced by the first and second audio heads when a magnetic tape subjected to recording in N-ple play mode. The head width of each of the third and fourth video heads is approximately two times as large as a track pitch formed on the magnetic tape at the time of N-ple play mode.
Also, it is preferable that the heights of arrangement of the third and fourth video heads and the first and second audio heads relative to a reference surface of the rotary body are set to positions with which at the time of N-ple play mode, the third and fourth video heads scan the magnetic tape in a manner delayed from the first and second audio heads by four or more tracks. Further, it is preferable that at the time of completion of recording, the stop of supply of an audio recording signal to the first and second audio heads is followed by the supply of a video recording signal to the third and fourth video heads with a time prolonged corresponding to the delay of scan of the magnetic tape by the third and fourth video heads from that by the first and second audio heads.
Further, the recording/reproducing apparatus of the present invention is characterized in that first and second video heads for recording or reproducing a video signal at the time of standard play mode in which the running speed of the magnetic tape is a standard speed, third and fourth video heads for recording or reproducing a video signal at the time of triple play mode in which the tape running speed is approximately ⅓ of the standard speed, and first and second audio heads for recording or reproducing an audio signal are provided as the magnetic head means on the outer periphery of the rotary body, and that at the time of N-ple play mode in which the tape running speed is approximately 1/N of the standard speed wherein N is an integer not smaller than 4, the recording is performed so that the third and fourth video heads record a video signal in a super-imposed manner on a track having an audio signal recorded on the magnetic tape by the first and second audio heads. In this case, the head width of each of the third and fourth video heads recording or reproducing a video signal at the time of triple play mode and at the time of N-ple play mode is substantially equal to a track pitch at the time of triple play mode.
Further, the recording/reproducing apparatus of the present invention is characterized by comprising first and second video heads for alternately forming recording tracks on a recording medium, delay means for delaying at least one of video recording signals supplied to the first and second video heads, and delay control means for controlling a delay time of the delay means substantially for each recording track, the delay control means making a control so that horizontal synchronizing signals recorded on the recording medium are arranged between adjacent recording tracks.
Further, the recording/reproducing apparatus of the present invention is characterized by comprising means for making the switching between a first recording/reproducing mode in which the recording/reproducing is performed with the recording medium being run at a first running speed and with the rotary body being rotated at a first rotating speed, a second recording/reproducing mode in which the recording/reproducing is performed with the recording medium being run at a second running speed and with the rotary body being rotated at said first rotating speed, and a third recording/reproducing mode in which the recording/reproducing is performed with the recording medium being run at a third running speed and with the rotary body being rotated at a second rotating speed. In this case, it is preferable that the second running speed is 1/N of the first running speed wherein N is an integer not smaller than 2, the third running speed is 1/M of th
Minabe Kouji
Nishijima Hideo
Ohno Shoji
Watanabe Katsuyuki
Antonelli Terry Stout & Kraus LLP
Garber Wendy R.
Hitachi Ltd
Onuaku Christopher
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