EP0553949A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for decoding digital data representative of a compressed digital image signal
Assignee: AT&T Inc
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Filing: 1993-01-05
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Granted: —
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Expires: 2013-01-05
Abstract
Abstract An apparatus provides digital data representative of a compressed high definition video image signal in a manner such that a conventional video tape recorder (VTR) employing current electrical and mechanical technologies is adaptable for reading this data for display in special modes such as fast forward, reverse and still frame. To minimize the loss of data while the VTR is operating in one of these special modes, the data representative of the high definition image signal is decoded by the apparatus to yield available time slots in the data stream. These time slots are then filled with data which duplicates the most important of the original transmitted data then existing in other time slots in the data stream. This duplicating of the data increases the likelihood that the important picture information will be read by the VTR while operating in a special mode. To facilitate fast recovery from lost of synchronization, the apparatus utilizes a small fraction of the original image which is included in each section or slice of the transmitted image. As synchronization is reacquired, the high definition video image is built from the image found in the slices.
Inventors
- 👤 Scott Carroll Knauer
- 👤 Kim Nigel Matthews
- 👤 Arun Narayan Netravali
- 👤 Eric David Petajan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:31
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N21/00; H04N21/20; H04N21/23; H04N21/236; H04N21/40; H04N21/43; H04N21/434; H04N5/91; H04N5/92; H04N5/926; H04N5/9261; H04N5/9264; H04N5/93; H04N7/00; H04N7/24; H04N7/52; H04N7/54; H04N5/78; H04N5/782; H04N5/783
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
92 words
An apparatus for decoding digital data representative of a compressed digital image signal, the data being arranged in a variable length coding format in a plurality of field time intervals, each field time interval further including a plurality of segment times populated with digital data CHARACTERIZED IN THAT the apparatus comprises means for decoding the digital data in the segment times to yield empty segment times; and means for repopulating said empty segment times with data which duplicates the original data contained in other of the segment times by said decoding means.
Claim 2
Dependent Claim
30 words
The apparatus of claim 1 CHARACTERIZED IN THAT said empty segment times are repopulated by said repopulating means with data which duplicates the original data contained in adjacent segment times.
Claim 3
Dependent Claim
38 words
The apparatus of claim 2 CHARACTERIZED IN THAT said empty segment times are repopulated by said repopulating means with data which duplicates the original data contained in segment times located other than adjacent to said empty segment times.
Claim 4
Dependent Claim
23 words
The apparatus of claim 3 CHARACTERIZED IN THAT said repopulating means repopulates the empty segment times with global information from other segment times.
Claim 5
Dependent Claim
29 words
The apparatus of claim 4 CHARACTERIZED IN THAT said repopulating means repopulates the empty segment times with information from other segment times transmitted in a 1-bit per symbol format.
Claim 6
Dependent Claim
22 words
The apparatus of claim 2 CHARACTERIZED IN THAT further comprising means for recording the digital data for display on a storage medium.
Claim 7
Dependent Claim
12 words
The apparatus of claim 6 wherein the storage medium is a tape.
Claim 8
Dependent Claim
13 words
The apparatus of claim 6 wherein the storage medium is an optical disk.
Claim 9
Dependent Claim
42 words
The apparatus of claim 6 CHARACTERIZED IN further comprising means for inspecting the recorded digital data, the inspecting means reading the original data stored in segment times and upon finding this data defective, reading the duplicate data stored in other segment times.
Claim 10
Dependent Claim
24 words
The apparatus of claim 9 CHARACTERIZED IN further comprising assigning means for associating an identifying means with each one of the repopulated segment times.
Claim 11
Dependent Claim
23 words
The apparatus of claim 6 CHARACTERIZED IN THAT the inspecting means reads the data stored in the segment times in a normal speed.
Claim 12
Dependent Claim
24 words
The apparatus of claim 6 CHARACTERIZED IN THAT the inspecting means reads the data stored in the segment times in a fast forward speed.
Claim 13
Dependent Claim
33 words
The apparatus of claim 12 CHARACTERIZED IN THAT the data in the segments comprises variable length code data, said data containing a fraction of the original video image recorded as a leak factor.
Claim 14
Dependent Claim
34 words
The apparatus of claim 13 CHARACTERIZED IN further comprising means for amplifying the leak factor in response to the inspecting means reading the data stored in the segment times in a fast forward speed.
Claim 15
Dependent Claim
25 words
The apparatus of claim 6 CHARACTERIZED IN further comprising inspecting means for reading the data stored in the segment times in a fast backward speed.
Claim 16
Dependent Claim
33 words
The apparatus of claim 15 CHARACTERIZED IN THAT the data in the segments comprises variable length code data, said data containing a fraction of the original video image recorded as a leak factor.
Claim 17
Dependent Claim
34 words
The apparatus of claim 16 CHARACTERIZED IN further comprising means for amplifying the leak factor in response to the inspecting means reading the data stored in the segment times in a fast backward speed.
Claim 18
Dependent Claim
48 words
The apparatus of claim 14 or 17 CHARACTERIZED IN further comprising means for limiting the level of amplification of the digital data contained in the segment times, the limiting means being applied to the data in the segment times other than the data recorded as the leak factor.
Claim 19
Dependent Claim
25 words
The apparatus of claim 6 CHARACTERIZED IN further comprising inspecting means for reading the data stored in the segment times in a slow forward speed.
Claim 20
Dependent Claim
46 words
The apparatus of claim 19 CHARACTERIZED IN further comprising means for processing N frames at a time where N is a number of the previous N frames, the processing means including obtaining the previous N frames and combining these frames for generating an image for display.
Claim 21
Dependent Claim
25 words
The apparatus of claim 6 CHARACTERIZED IN further comprising inspecting means for reading the data stored in the segment times in a slow backward speed.
Claim 22
Dependent Claim
25 words
The apparatus of claim 6 CHARACTERIZED IN further comprising inspecting means for reading the data stored in the segment times for providing a freeze frame.
Claim 23
Dependent Claim
36 words
The apparatus of claim 22 CHARACTERIZED IN further comprising a buffer means for storing the data stored in the segment times, the buffer means being inhibited from being updated while the freeze frame is being provided.
Claim 24
Independent Claim
88 words
A method for decoding digital data representative of a compressed digital image signal, the data being arranged in a variable length coding format in a plurality of field time intervals, each field time interval further including a plurality of segment times populated with the digital data CHARACTERIZED IN THAT the method comprises the steps of decoding the digital data in the segment times to yield empty segment times, and repopulating said empty segment times with data which duplicates the original data contained in other of the segment times.
Claim 25
Dependent Claim
29 words
The method of claim 24 CHARACTERIZED IN further comprising the step of repopulating said empty segment times with data which duplicates the original data contained in adjacent segment times.
Claim 26
Dependent Claim
37 words
The method of claim 25 CHARACTERIZED IN further comprising the step of repopulating said empty segment times with data which duplicates the original data contained in segment times located other than adjacent to said empty segment times.
Claim 27
Dependent Claim
22 words
The method of claim 26 CHARACTERIZED IN further comprising the step of recording the digital data for display on a storage medium.
Claim 28
Dependent Claim
35 words
The method of claim 26 CHARACTERIZED IN further comprising the steps of reading the original data stored in segment times and upon finding this data defective, reading the duplicate data stored in other segment times.
References Cited (Backward Citations)
No citation records indexed.
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