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EP0482888A2
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EP
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Video signal recording/reproducing apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1991-10-22
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Granted: —
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Expires: 2011-10-22
Abstract
Abstract Disclosed are a video signal recording apparatus for dividing digital video signal into blocks, transforming orthogonally, quantizing, coding in a variable length, and recording always in identical data quantity in a unit of specific number of blocks, and a video signal reproducing apparatus for decoding the recorded signal in variable length, quantizing inversely, transforming inversely and orthogonally, and reproducing the original digital video signal. The coding dataare divided in two code rows; the individual low frequency components are assigned to separate sync blocks, and high frequency components are assigned to different sync blocks and recorded. If the sync block of high frequency components is wrong during reproduction, it is possible to decode only the low frequency components. At the time of high speed reproduction, the screen is updated according to the reproducing speed. By recording the position information indicating the boundary position between two code rows, the range of error concealment may be narrowed.
Inventors
- 👤 Masakazu Nishino
- 👤 Tatsuro Juri
- 👤 Hideki Ohtaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 08:20
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N5/9261; H04N5/9264; H04N19/00; H04N19/60; G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; H04N5/93; H04N5/94; H04N5/945; H04N5/78; H04N5/782; H04N5/783
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
117 words
A video signal recording apparatus comprising: orthogonal transformation means for dividing video signal into blocks, and transforming orthogonally, coding means for coding the output of the orthogonal transformation means in variable length so that the data quantity in a specific number of blocks may be identical, and recording means for recording the output of the coding means on a recording medium, wherein when the coding means sets the output of the orthogonal transformation means in the specific number of blocks to the identical data quantity, if the output of the orthogonal transformation means does not settle within the identical data quantity, only the variable length codes in the identical data quantity are sent into the recording means.
Claim 2
Dependent Claim
37 words
A video signal recording apparatus of claim 1, wherein a variable length coding signal obtained from other video signal recording apparatus or reproducing apparatus is entered, and is recorded on a recording medium by the recording means.
Claim 3
Dependent Claim
123 words
A video signal recording apparatus of claim 1 or 2, wherein the coding means divides the code words into a specific number of sync blocks when sending the code words in the specific number of blocks to the recording means, in which a first code word row of the code words is disposed in a first sync block from important components, a second code word row of the code words is disposed in a second sync block from important components, and the code word rows not allocated in the first sync block of the first code word row and the code word rows not allocated in the second sync block of the second code word row are disposed in a third sync block.
Claim 4
Dependent Claim
67 words
A video signal recording apparatus of claim 3, wherein the coding means disposes code words in the third sync block, in which the code words of the first code word row not allocated in the first sync block are sequentially disposed in the third sync block, and the code word rows of the second code word row not allocated in the second sync block are sequentially disposed.
Claim 5
Dependent Claim
138 words
A video signal recording apparatus of claim 3, wherein the coding means disposes the code words into the specific number of sync blocks, in which when the data quantity of the first code word row is smaller than the data quantity that can be allocated in the first sync block, and the data quantity of the second code word row is more than the data quantity that can be allocated in the second sync block, after disposing the first code word row in the first sync block, the code words of the second code word row that cannot be allocated in the second sync block are disposed in the first sync block, and the code words of the second code word row that cannot be allocated in the first sync block are disposed in the third sync block.
Claim 6
Dependent Claim
133 words
A video signal recording apparatus of claim 3, wherein the coding means disposes into the specified number of sync blocks, in which when the data quantity of the second code word row is smaller than the data quantity that can be allocated in the second sync block, and the data quantity of the first code word row is more than the data quantity that can be allocated in the first sync block, after disposing the second code word row in the second sync block, the code words of the first code word row that cannot be allocated in the first sync block are disposed in the second sync block, and the code words of the first code word row not allocated in the second sync block are disposed in the third sync block.
Claim 7
Dependent Claim
67 words
A video signal recording apparatus of claim 4, 5, or 6, wherein the coding means sends the variable length code to the recording means, in which the position information showing the boundary position of the first and second code word rows disposed on the first, second and third sync blocks is sent together, and the recording means records the position information together with the variable length code.
Claim 8
Dependent Claim
55 words
A video signal recording apparatus of claim 7, wherein the coding means sends the variable length code to the recording means, in which the concealment information showing the concealment state to the first and second code word rows is sent together, and the recording means records the concealment information together with the variable length codes.
Claim 9
Dependent Claim
67 words
A video signal recording apparatus of claim 4, 5, 6, 7 or 8, wherein the coding means sends only the variable length codes within the data quantity when the data quantity in the specific number of blocks cannot be allocated in the identical data quantity, while the signals not sent to the recording means are only high frequency components of the output of the orthogonal transformation means.
Claim 10
Dependent Claim
30 words
A video signal recording apparatus of claim 8, wherein the coding means includes an end signal of the block in the high frequency components not sent to the recording means.
Claim 11
Dependent Claim
47 words
A video signal recording apparatus of claim 9, wherein the coding means sends only the variable length code within the identical data quantity to the recording means, and the end signal of the specified number of blocks is sent to the signal sent to the recording means.
Claim 12
Dependent Claim
128 words
A video signal reproducing apparatus comprising: detecting means for detecting the signal recorded by the video signal recording apparatus of claim 10 or 11 from the recording medium, thereby obtaining a recorded variable length code, decoding means for decoding the output of the detecting means in a variable length, and inverse orthogonal transformation means for transforming the output of the decoding means inversely and orthogonally, wherein the decoding means decodes in a variable length, assuming that an end signal reaching the specific number of blocks would follow right after the detected recording signal, if there is no end signal of the specific number of blocks in the recording signal within the identical data quantity or in the recording signal within the data region determined by the position information.
Claim 13
Dependent Claim
25 words
A video signal reproducing apparatus of claim 12, wherein the variable length code may be sent to other video signal recording apparatus or reproducing apparatus.
Claim 14
Dependent Claim
36 words
A video signal reproducing apparatus of claim 12 or 13, wherein the output of the detecting means, if wrong, is replaced by other signal having the output of the detecting means coded in a variable length.
Claim 15
Dependent Claim
40 words
A video signal reproducing apparatus of claim 14, wherein all variable length codes in the specific number of blocks are replaced by other signals when replacing the output of the detecting means with other signals coded in a variable length.
Claim 16
Dependent Claim
54 words
A video signal reproducing apparatus of claim 14, wherein the output of the detecting means is replaced by other signals coded in a variable length, but are not replaced with other signals if an error is contained only in the third sync block of the variable length codes in the specific number of blocks.
Claim 17
Dependent Claim
60 words
A video signal reproducing apparatus of claim 14, wherein the output of the detecting means is replaced by other signals coded in a variable length, and if either the first sync block or the second sync block of the variable length codes in the specific number of blocks is wrong, only the wrong sync block is replaced by other signals.
Claim 18
Dependent Claim
76 words
A video signal reproducing apparatus of claim 14, wherein the output of the detecting means is replaced by other signals coded in a variable length, and if either the first sync block or the second sync block of the variable length codes in the specific number of blocks is wrong, only the wrong sync block and the code word row contained in the wrong sync block in the third sync block are replaced with other signals.
Claim 19
Dependent Claim
45 words
A video signal reproducing apparatus of claim 14, 15, 16, 17 or 18, wherein when the output of the detecting means is replaced with other signals coded in a variable length if the output of the detecting means is wrong, the concealment information is updated.
References Cited (Backward Citations)
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