Patent US2958324A successfully refreshed from Google Patents.
EP0740474A2
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Video coding and decoding method and system with teletext capability
Assignee: Oki Electric Industry Co Ltd
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Filing: 1996-04-09
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Granted: —
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Expires: 2016-04-09
Abstract
Abstract A video coding apparatus receives a video signal containing moving-picture information, together with other information present in certain horizontal scanning lines in the vertical blanking intervals. The video coding apparatus compresses the moving-picture information into a compressed digital video data stream, assembles the other information into packets, and multiplexes the packets with the compressed digital video data stream to generate an output signal. A video decoding apparatus demultiplexes this signal to separate the packets from the compressed digital video data stream, decompresses the compressed digital video data, and outputs a video signal having information obtained from the packets in certain horizontal scanning lines in the vertical blanking intervals, and decompressed moving-picture information in other horizontal scanning lines.
Inventors
- 👤 Shun Oshita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 15:50
CPC Classifications
G; G06; G06T; G06T9/00; G06T9/007; H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/235; H04N21/40; H04N21/43; H04N21/435; H04N21/47; H04N21/488; H04N21/4888
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
219 words
A method of coding and decoding a video signal containing moving-picture information in horizontal scanning lines not disposed in vertical blanking intervals, and containing other information in certain first horizontal scanning lines disposed in said vertical blanking intervals, comprising the steps of: compressively coding said moving-picture information to generate a compressed digital video data stream; assembling said other information into packets; multiplexing said packets with said compressed digital video data stream to generate a data signal; demultiplexing said data signal to separate said packets from said compressed digital video data stream; generating a display synchronizing signal indicating timings of horizontal scanning lines and vertical blanking intervals; disassembling said packets to generate a first video signal having said other information in certain second horizontal scanning lines disposed in the vertical blanking intervals indicated by said display synchronizing signal; decoding said compressed digital video data to generate a second video signal having moving-picture information in horizontal scanning lines not disposed in the vertical blanking intervals indicated by said display synchronizing signal; selecting said first video signal during said second horizontal scanning lines; selecting said second video signal during horizontal scanning lines other than said second horizontal scanning lines; and combining the first video signal when thus selected and the second video signal when thus selected to produce an output video signal.
Claim 2
Dependent Claim
12 words
The method of claim 1, wherein said other information is teletext information.
Claim 3
Dependent Claim
27 words
The method of claim 2, comprising the further step of supplying said output video signal to a television monitor (40) equipped to receive and display teletext information.
Claim 4
Dependent Claim
17 words
The method of claim 1, wherein said packets contain digitized waveforms of said first horizontal scanning lines.
Claim 5
Dependent Claim
51 words
The method of claim 1, wherein said step of assembling comprises: storing said other information in a first-in-first-out buffer (14); generating header information; reading a certain amount of said other information from said first-in-first-out buffer (14); and outputting said header information and said certain amount of other information as a packet.
Claim 6
Dependent Claim
42 words
The method of claim 5 wherein, if said certain amount of said other information is not available in said first-in-first-out buffer (14), said certain amount of said other information is replaced in said packet with dummy information, thereby creating a dummy packet.
Claim 7
Dependent Claim
26 words
The method of claim 6, wherein said header information comprises: a synchronization pattern (42); and flag information (44) indicating whether said packet is a dummy packet.
Claim 8
Dependent Claim
119 words
A video coding apparatus for coding a video signal that has vertical blanking intervals, contains moving-picture information in horizontal scanning lines not disposed in said vertical blanking intervals, and contains other information in certain horizontal scanning lines disposed in said vertical blanking intervals, comprising: a compressive encoder (10) for generating a compressed digital video data stream from said moving-picture information; a packet assembler (12) for taking said other information from said certain horizontal scanning lines in said vertical blanking intervals and assembling said other information into packets; and a multiplexer (20) coupled to said compressive encoder (10) and said packet assembler (12), for combining said packets with said compressed digital video data stream to generate an output data signal.
Claim 9
Dependent Claim
14 words
The video decoding apparatus of claim 8, wherein said other information is teletext information.
Claim 10
Dependent Claim
21 words
The video coding apparatus of claim 8, wherein said compressive encoder (10) and said multiplexer (20) conform to MPEG-2 technical specifications.
Claim 11
Dependent Claim
92 words
The video coding apparatus of claim 8, wherein said packet assembler (12) comprises: a buffer circuit (14) for receiving and storing said other information; a control circuit (16) coupled to said buffer circuit (14), for counting horizontal scanning lines and generating read control signals and write control signals for said buffer circuit (14); and a packet packing circuit (18) for reading a certain amount of said other information from said buffer circuit (14), generating header information, and outputting said certain amount of said other information and said header information as a packet.
Claim 12
Dependent Claim
23 words
The video coding apparatus of claim 11, wherein said buffer circuit (14) receives and stores digitized waveforms of said certain horizontal scanning lines.
Claim 13
Dependent Claim
20 words
The video coding apparatus of claim 11, wherein said header information comprises a synchronization pattern (42) and flag information (44).
Claim 14
Dependent Claim
54 words
The video decoding apparatus of claim 13 wherein, when said certain amount of said other information is not present in said buffer circuit (14), said packet packing circuit (18) outputs a dummy packet comprising said header information and dummy information, and identifies said dummy packet by the flag information (44) in said header information.
Claim 15
Dependent Claim
174 words
A video decoding apparatus for decoding a multiplexed data signal, containing both compressed digital video data and packets of other information, to generate an output video signal synchronized with a display synchronizing signal indicating timings of horizontal scanning lines, comprising: a demultiplexer (22) for receiving said multiplexed data signal and separating said compressed digital video data from said packets of other information; a packet disassembler (26) coupled to said demultiplexer (22), for receiving said packets of other information and disassembling said packets of other information to generate a first video signal; a decompressive decoder (24) coupled to said demultiplexer (22), for receiving said compressed digital video data and decoding said compressed digital video data to generate a second video signal; and a selector (34) coupled to said decompressive decoder (24) and said packet disassembler (26), for selecting said first video signal during certain horizontal scanning lines among said horizontal scanning lines, and selecting said second video signal during horizontal scanning lines other than said certain horizontal scanning lines, thereby producing said output video signal.
Claim 16
Dependent Claim
24 words
The video decoding apparatus of claim 15, wherein said certain horizontal scanning lines are disposed in vertical blanking intervals of said output video signal.
Claim 17
Dependent Claim
20 words
The video decoding apparatus of claim 15, wherein said other information comprises digitized waveforms of said certain horizontal scanning lines.
Claim 18
Dependent Claim
14 words
The video decoding apparatus of claim 15, wherein said other information is teletext information.
Claim 19
Dependent Claim
21 words
The video coding apparatus of claim 15, wherein said demultiplexer (22) and said decompressive decoder (24) conform to MPEG-2 technical specifications.
Claim 20
Dependent Claim
22 words
The video decoding apparatus of claim 15, wherein each packet among said packets comprises header information in addition to said other information.
Claim 21
Dependent Claim
152 words
The video decoding apparatus of claim 20, wherein said packet disassembler (26) comprises: a packet unpacking circuit (28) for receiving said packets, discarding said header information, and outputting said other information; a buffer circuit (32) coupled to said packet unpacking circuit (28) and said selector (34), for storing the other information not discarded by said packet unpacking circuit (28); and a control circuit (30) coupled to said buffer circuit (32), for counting the horizontal scanning lines indicated by said display synchronizing signal, generating read control signals and write control signals for said buffer circuit (32), and generating selection control signals for said selector (34), said read control signals causing said other information stored in said buffer circuit (32) to be read out to said selector (34) during said certain horizontal scanning lines, and said selection control signals causing said selector (34) to select said other information during said certain horizontal scanning lines.
Claim 22
Dependent Claim
31 words
The video decoding apparatus of claim 21, wherein said header information comprises a synchronization pattern (42) and flag information (44), said flag information (44) indicating whether said other information is valid.
Claim 23
Dependent Claim
30 words
The video decoding apparatus of claim 22, wherein said packet unpacking circuit (28) discards said other information when said flag information (44) indicates that said other information is not valid.
References Cited (Backward Citations)
No citation records indexed.
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