EP0637893A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Transcoding device
Assignee: Koninklijke KPN NV
•
Filing: 1994-08-03
•
Granted: —
•
Expires: 2014-08-03
Abstract
Abstract Known transcoders for compressed video signals comprise a decoder and a coder coupled thereto, between which a data signal is transmitted. Because compressed video signals comprise so-called difference pictures and normal pictures, both the decoder and the coder should have a feedback loop which is utilized in decoding and coding a difference picture and is not utilized in decoding and coding a normal picture. For example, for the purpose of prediction means (motion compensation and motion estimation) present in the feedback loop of the coder, much computation has to be carried out in the coder. The computation required is considerably reduced by concomitantly transmitting one or more information signals in addition to the data signal in a transcoder according to the invention, and complete decoding and complete coding no longer takes place.
Inventors
- 👤 Dolf Albert Schinkel
- 👤 Arian Koster
- 👤 Johannes Fransiscus A. Koppelmans
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 17:07
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/40; H04N19/10; H04N19/102; H04N19/124; H04N19/134; H04N19/157; H04N19/162; H04N19/189; H04N19/196; H04N19/46; H04N19/48; H04N19/50; H04N19/503; H04N19/51; H04N19/60; H04N19/61; H04N19/146; H04N19/152
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
Transcoding device comprising a decoding section for - receiving a first coded bit stream, and - converting the first coded bit stream into at least one data signal, and comprising a coding section for - receiving at least one data signal, and - converting at least one data signal into a second coded bit stream, which transcoding device has a coupling, situated between the decoding section and the coding section, for transporting at least one data signal, characterized in that the transcoding device has a further coupling, situated between the decoding section and the coding section, for transporting at least one information signal.
Claim 2
Dependent Claim
145 words
Transcoding device according to Claim 1, characterized in that the decoding section is provided with - data reprocessing means for generating a data signal, and - demultiplexing means having an input for receiving the first coded bit stream and having a first output coupled to the data reprocessing means and having a second output for generating an information signal, the coding section being provided with - data processing means for receiving a data signal, and - multiplexing means having a first input coupled to the data processing means and having a second input for receiving an information signal and having an output for generating the second coded bit stream, the coupling being disposed between the data reprocessing means and the data processing means, and the further coupling being disposed between the second output of the demultiplexing means and the second input of the multiplexing means.
Claim 3
Dependent Claim
40 words
Transcoding device according to Claim 2, characterized in that the data reprocessing means comprise a control input which is coupled to the second output, and the data processing means comprise a control input which is coupled to the second input.
Claim 4
Dependent Claim
34 words
Transcoding device according to Claim 2 or 3, characterized in that the data reprocessing means comprise decoding means and inverse quantization means, and the data processing means comprise further quantization means and coding means.
Claim 5
Dependent Claim
54 words
Transcoding device according to Claim 4, characterized in that the data reprocessing means comprise inverse transformation means and prediction means disposed in a feedback loop, and the data processing means comprise (further) transformation means and (further) prediction means disposed in a feedback loop containing therein inverse further quantization means and inverse (further) transformation means.
Claim 6
Dependent Claim
39 words
Transcoding device according to Claim 2, 3, 4 or 5, characterized in that the information signal is a quantization control signal, the second output being a quantization control signal output and the second input a quantization control signal input.
Claim 7
Dependent Claim
34 words
Transcoding device according to Claim 2, 3, 4 or 5, characterized in that the information signal is a vector signal, the second output being a vector output and the second input a vector input.
Claim 8
Dependent Claim
34 words
Transcoding device according to Claim 2, 3, 4 or 5, characterized in that the information signal is a mode signal, the second output being a mode output and the second input a mode input.
Claim 9
Dependent Claim
47 words
Transcoding device according to Claim 2, 3, 4 or 5, characterized in that the information signal comprises a vector signal and a mode signal, the second output comprising a vector output and a mode output and the second input comprising a vector input and a mode input.
Claim 10
Dependent Claim
61 words
Transcoding device according to Claim 2, 3, 4 or 5, characterized in that the information signal comprises a quantization control signal, a vector signal and a mode signal, the second output comprising a quantization control signal output, a vector output and a mode output and the second input comprising a quantization control signal input, a vector input and a mode input.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.