EP0559467A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Digital video signal magnetic recording and/or reproducing apparatus
Assignee: Panasonic Holdings Corp
•
Filing: 1993-03-04
•
Granted: —
•
Expires: 2013-03-04
Abstract
Abstract In a video signal digital magnetic recording and/or reproducing apparatus, an input image data array is rearranged into a different data array appropriate for data compression and then subjected to a data compression by variable length coding. The resulting data are re-arranged after the data compression and then recorded sequentially onto a video track of a magnetic tape in the same order as that in the frame. In a high-speed playback mode, only the lower frequency component data is decoded every sync block, so that the data reproduced from one video track adjoin each other in the playback picture on the screen.
Inventors
- 👤 Hirofumi Uchida
- 👤 Tatsuro Juri
- 👤 Hideki Ohtaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:42
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N5/9261; H04N5/9264
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
307 words
A video signal digital magnetic recording and/or reproducing apparatus comprising: input shuffling means (3) for shuffling input image data having an image data memory means for storing image data corresponding to at least one field image data, wherein said input shuffling means divides said one field image data into a specified number of image blocks which are aligned at original image block positions and selectively reads among the specified number of image blocks which are spaced a pre-determined distance from each other and aligns said read image blocks in a pre-determined order to define one image block group; coding means (4) for coding said image blocks such that the coded image blocks in each image block group has a total data amount equal to or less than a pre-determined data length thereby to effect a variable length coding in each image block; data length adjusting means (5) for adjusting data length of each image block to form sync block data by cutting a coded image block which has a data length longer than a pre-determined sync block data length so as to be equal to one sync block data length and filling the cut data portion to be added to a coded image block which has a data length shorter than one sync block data length; and recording deshuffling means (6) having a coded image data memory means for storing said coded image blocks from said data length adjusting means (5) at positions corresponding to said original image block positions, said coded image data aligned corresponding to said original image block positions being divided into a plurality of stripes in a first direction, each stripe having a data width corresponding to one or more image blocks, wherein said recording deshuffling means sequentially reads the stripes of said coded image data thereby to deshuffle the sync block data.
Claim 2
Dependent Claim
41 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in claim 1 further comprises reproduction shuffling means (14) for rearranging the order of the sync block data reproduced from a magnetic tape into an order of decoding the data.
Claim 3
Dependent Claim
34 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in claim 2, wherein an error correction is effected after performing the reproduction shuffling operation thereby to perform an error correction between tracks.
Claim 4
Dependent Claim
44 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in any of the preceding claims further comprises decoding means (15) for converting the lower frequency component of the coded data included in each sync block into image data of each image block.
Claim 5
Dependent Claim
44 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in claim 4 further comprises output deshuffling means (17) for deshuffling the decoded image data and re-arranging the order thereof into the same order of the image data as that on the frame.
Claim 6
Dependent Claim
66 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in any one of the preceding claims, wherein each of the image blocks formed by said input shuffling means is composed of i horizontal pixels x j vertical pixels x n fields ( i , j and n : integers) and each image block group is composed of m image blocks ( m : integer).
Claim 7
Dependent Claim
60 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in any one of the preceding claims, wherein said recording deshuffling means divides a frame into k portions ( k : integer) and rearranges the sync block data so that the data of image blocks in each of the divided frame portions are successively recorded onto one video track.
Claim 8
Dependent Claim
62 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in any one of the preceding claims, wherein said recording deshuffling means divides a frame into k portions ( k : integer) and rearranged the sync block data so that the data of image blocks in each of the divided frame portions are successively recorded onto a plurality of video tracks.
Claim 9
Dependent Claim
35 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in any one of the preceding claims, wherein said recording deshuffling means deshuffles the sync block data on each track of the magnetic tape.
Claim 10
Dependent Claim
44 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in any one of the preceding claims, wherein said input image data is recorded by means of a recording head in p ( p : integer) channels approximately simultaneously on a magnetic tape.
Claim 11
Dependent Claim
52 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in claim 10, wherein when one frame is recorded on p x k tracks, the sync blocks on the p tracks are arranged in the same order as that of the image blocks in the frame corresponding to the sync blocks.
Claim 12
Dependent Claim
43 words
The video signal digital magnetic recording and or reproducing apparatus as claimed in any one of the preceding claims, wherein said input shuffling means (3) receives digital image data arranged in the same order as that of the image data in a frame.
Claim 13
Dependent Claim
67 words
The video signal digital magnetic recording and/or reproducing apparatus as claimed in any one of the preceding claims, wherein said data length adjusting means (5) forms sync block data by cutting a high frequency component as the cut data portion of a coded image block to be added so that each sync block includes a lower frequency component of coded data of at least one image block.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.