Method and apparatus for recording video signals on a record medium

• US 5,557,420 A
• Filed: 08/01/1994
• Issued: 09/17/1996
• Est. Priority Date: 11/05/1991
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yanagihara, Naofumi, Kubota, Yukio, Kanoto, Keiji
• Primary Examiner(s): Chin, Tommy P.
• Assistant Examiner(s): Chevalier, Robert
• Application Number:
  US08/283,652
• Time in Patent Office: 778 Days
• Field of Search: 358/335, 358/310, 358/342, 360/32, 360/22, 360/33.1, 360/64, 360/38.1, 348/384, 348/409, 348/388, 348/397
• US Class Current: 386/314
• CPC Class Codes: H04N 5/9264 using transform coding
• CPC Class Codes: H04N 9/8047 using transform coding

Abstract

Methods and apparatus are provided for recording video signals in a plurality of tracks on a recording medium. In certain embodiments, first and second video signal intervals include respective first and second common sub-area signals representing at least one common sub-area of a video screen. The common sub-area signals of the first and second video signal intervals are recorded at respectively different locations within the plurality of tracks. In certain embodiments, component color video signals including luminance signals and first and second color difference signals are divided into a plurality of discrete cosine transformation (DCT) blocks and blocks representing common respective subdivisions of a video screen are assembled into corresponding macro blocks. Adjacent macro blocks are assembled into super macro blocks which, in turn, are arranged in a shuffled sequence relative to the positions of their subdivisions on the video screen for recording in the shuffled sequence. In certain embodiments, digital video signals representing a video screen are recorded in a plurality of tracks on a recording medium after dividing the digital video signals into a plurality of macro blocks assembled into sub-area groups of the video screen. The sub-area groups are shuffled by forming a sequence of track units each including a plurality of the sub-area groups one each from a respective horizontal division of the video screen. Each track unit is recorded in a respective one of a plurality tracks on the recording medium.

Claims

1. A method of recording video signals of first and second video signal intervals in a plurality of sequentially arranged tracks on a recording medium, comprising the steps of:

respectively dividing said first and second video signal intervals into first and second pluralities of areas of a video screen;

respectively dividing said first and second pluralities of areas into first and second sequences of sub-areas of said video screen;

respectively dividing said first and second sequences of sub-areas into first and second sequences of macroblocks, at least one pair of macroblocks of said first and second sequences of macroblocks representing co-located positions of said video screen and thereby forming at least one pair of first and second common macroblocks;

respectively selecting corresponding macroblocks in corresponding sub-areas from each of said first and second sequences of macroblocks of each of said first and second sequences of sub-areas of each of said first and second pluralities of areas to form first and second sequences of buffering units, each of said corresponding sub-areas representing a portion of said video screen having a respectively different horizontal position and a respectively different vertical position than the other ones of said corresponding sub-areas;

recording the video signals of said first sequence of buffering units in a first predetermined pattern in a first group of a plurality of sequentially arranged tracks; and

recording the video signals of said second sequence of buffering units in a second predetermined pattern in a second group of a plurality of sequentially arranged tracks separate from said first group, said second predetermined pattern being different than said first predetermined pattern such that the first and second common macroblocks are recorded at respective first and second locations within the first and second groups of tracks by different recording heads.

2. The method of claim 1, wherein the steps of recording the first and second sequences of buffering units comprise recording said first and second sequences of buffering units in the respective first and second predetermined patterns such that the first and second common macroblocks are reproducible by respectively different reproducing devices.

3. The method of claim 1, wherein the steps of recording the first and second sequences of buffering units comprise recording the first and second common macroblocks in the respective first and second recording locations that are located to prevent a defect in the recording medium from affecting the reproduceability of both of the first and second common sub-area signals.

4. The method of claim 3, wherein the steps of recording the first and second sequences of buffering units comprise recording the first and second common macroblocks at said respective first and second locations spaced with respect to a lateral dimension of said magnetic tape so that a longitudinally extending defect affects only the reproduceability of one of the first and second common macroblocks.

5. The method of claim 1, wherein the step of respectively dividing said first and second sequences of sub-areas comprises respectively dividing said first and second sequences of sub-areas into first and second sequences of super-macroblocks and respectively dividing said first and second sequences of super-macroblocks into first and second sequences of macroblocks, and

wherein the step of respectively selecting corresponding macroblocks in corresponding sub-areas comprises respectively selecting corresponding super-macroblocks in corresponding sub-areas from each of said first and second sequences of super-macroblocks of each of said first and second sequences of sub-areas of each of said first and second pluralities of areas to form first and second sequences of buffering units.

6. The method of claim 1, wherein the step of respectively selecting corresponding macroblocks in corresponding sub-areas comprises respectively selecting corresponding macroblocks in corresponding sub-areas from each of said first and second sequences of macroblocks of each of said first and second sequences of sub-areas of each of said first and second pluralities of areas to form first and second sequences of respective first and second series of buffering units, each said series comprising the buffering units formed only from corresponding sub-areas, and

wherein the steps of recording the first and second sequences of buffering units comprise recording said first and second sequences of said first and second respective series of buffering units in said respective first and second groups of tracks such that a respective series of said first and second sequences is recorded on a respective one of said first and second groups of tracks.

7. The method of claim 6, wherein the steps of recording the first and second sequences of buffering units comprise recording said first and second sequences of said first and second respective series of buffering units in said respective first and second groups of tracks such that the buffering units of a respective one of said second respective series of buffering units are recorded on said respective one of said second group of tracks in the reverse order to which the buffering units of a respective one of said first respective series of buffering units are recorded on said respective one of said first group of tracks.

8. The method of claim 6, wherein the steps of recording the first and second sequences of buffering units comprise recording said first and second sequences of said first and second respective series of buffering units in said respective first and second groups of tracks such that the order in which each of the second respective series are recorded on said second group of tracks is cyclically offset in respect to the order in which each of the first respective series are recorded on said first group of tracks.

9. An apparatus for recording video signals of first and second video signal intervals in a plurality of sequentially arranged tracks on a recording medium, comprising:

means for respectively dividing said first and second video signal intervals into first and second pluralities of areas of a video screen, for respectively dividing said first and second pluralities of areas into first and second sequences of sub-areas of said video screen, for respectively dividing said first and second sequences of sub-areas into first and second sequences of macroblocks, at least one pair of macroblocks of said first and second sequences of macroblocks representing co-located positions of said video screen and thereby forming at least one pair of first and second common macroblocks, and for respectively selecting corresponding macroblocks in corresponding sub-areas from each of said first and second sequences of macroblocks of each of said first and second sequences of sub-areas of each of said first and second pluralities of areas to form first and second sequences of buffering units, each of said corresponding sub-areas representing a portion of said video screen having a respectively different horizontal position and a respectively different vertical position than the other ones of said corresponding sub-areas; and

recording means for respectively recording the video signals of said first and second sequences of buffering units in first and second predetermined patterns in respective first and second groups of sequentially arranged tracks, said second group of tracks separate from said first group of tracks, said second predetermined pattern different than said first predetermined pattern such that the first and second common macroblocks are recorded at respective first and second locations within the first and second groups of tracks by different recording heads.

10. The apparatus of claim 9, wherein the recording means is operative to record the first and second sequences of buffering units in the respective first and second predetermined patterns such that the first and second common macroblocks are reproducible by respectively different reproducing devices.

11. The apparatus of claim 9, wherein the recording means is operative to record the first and second common macroblocks in respective first and second recording locations that are located to prevent a defect in the recording medium from affecting the reproduceability of both of the first and second common sub-area signals.

12. The apparatus of claim 11, wherein the recording means is operative to record the first and second common macroblocks at said respective first and second locations spaced with respect to a lateral dimension thereof so that a longitudinally extending defect affects only the reproduceability of one of the first and second common macroblocks.

13. The apparatus of claim 9, wherein said means for respectively dividing respectively divides said first and second sequences of sub-areas into first and second sequences of super-macroblocks and respectively divides said first and second sequences of super-macroblocks into first and second sequences of macroblocks, and respectively selects corresponding super-macroblocks in corresponding sub-areas from each of said first and second sequences of super-macroblocks of each of said first and second sequences of sub-areas of each of said first and second pluralities of areas to form first and second sequences of buffering units.

14. The apparatus of claim 9, wherein said means for respectively dividing respectively selects corresponding macroblocks in corresponding sub-areas from each of said first and second sequences of macroblocks of each of said first and second sequences of sub-areas of each of said first and second pluralities of areas to form first and second sequences of respective first and second series of buffering units, each said series comprising the buffering units formed only from corresponding sub-areas, and

wherein said recording means records said first and second sequences of said first and second respective series of buffering units in said respective first and second groups of tracks such that a respective series of said first and second sequences is recorded on a respective one of said first and second groups of tracks.

15. The apparatus of claim 14, wherein said recording means records said first and second sequences of said first and second respective series of buffering units in said respective first and second groups of tracks such that the buffering units of a respective one of said second respective series of buffering units are recorded on said respective one of said second group of tracks in the reverse order to which the buffering units of a respective one of said first respective series of buffering units are recorded on said respective one of said first group of tracks.

16. The apparatus of claim 14, wherein said recording means records said first and second sequences of said first and second respective series of buffering units in said respective first and second groups of tracks such that the order in which each of the second respective series are recorded on said second group of tracks is cyclically offset in respect to the order in which each of the first respective series are recorded on said first group of tracks.