EP0181237A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Processing unit for digital picture signals with adaptive prediction
Assignee: NEC Corp
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Filing: 1985-11-11
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Granted: —
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Expires: 2005-11-11
Abstract
Abstract In a predictive encoder for use particularly in a conference television system, a signal processing unit is used in producing a prediction signal and comprises three prediction circuits (22, 23, 31) and a selection circuit (24) coupled to the prediction circuits. The prediction circuits are for producing an inframe, an interframe, and a background prediction signals, respectively. Those signals are produced by processing an original signal at instants which precede a current instant and are different from one another. The selection circuit (24) is for selecting one of the inframe, the interframe, and the background prediction signals. Therefore, it is possible to produce a prediction signal suitably predictive of the original signal. The signal processing circuit serves equally well in a predictive decoder.
Inventors
- 👤 Kazomoto Iinuma
- 👤 Toshio Koga
- 👤 Akihiro Furukawa
- 👤 Sakae Okubo
- 👤 Hideo Hashimoto
- 👤 Naoki Mukawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 17:28
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/50; H04N19/503
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
210 words
A signal processing unit for processing an original signal into a prediction signal predictive of the original signal at a current instant, comprising first predicting means (22) for predicting a current part of the original signal at the current instant to produce a first prediction component from a first part which appears in the original signal at a first instant previous to the current instant, and second predicting means (23) for predicting the current part at the current instant to produce a second prediction component from a second part appearing in the original signal at a second instant which precedes the current instant and is different from the first instant, characterised by third predicting means (31) for predicting the current part at the current instant to produce a third prediction component from a third part appearing in the original signal at a third instant which precedes the current instant and is different from the first and second instants, comparing means (38, 39) for comparing the first to third prediction components with the current part, and selecting means (36, 37) responsive to the comparing means for selecting one of the first to third prediction components as a current prediction component which is predictive of the current part in the original signal.
Claim 2
Dependent Claim
210 words
A signal processing unit for processing an original signal into a prediction signal predictive of the original signal at a current instant, comprising first predicting means (22) for predicting a current part of the original signal at the current instant to produce a first prediction component from a first part which appears in the original signal at a first instant previous to the current instant, and second predicting means (23) for predicting the current part at the current instant to produce a second prediction component from a second part appearing in the original signal at a second instant which precedes the current instant and is different from the first instant, characterised by third predicting means (31) for predicting the current part at the current instant to produce a third prediction component from a third part appearing in the original signal at a third instant which precedes the current instant and is different from the first and second instants, comparing means (38, 39) for comparing the first to third prediction components with the current part, and selecting means (36, 37) responsive to the comparing means for selecting one of the first to third prediction components as a current prediction component which is predictive of the current part in the original signal.
Claim 3
Dependent Claim
51 words
A signal processing unit as claimed in claim 1, characterised by additional processing means (26, 21, 27) coupled to the first predicting, second predicting, third predicting, and selecting means (22, 23, 31, 36, 37) and responsive to a unit input signal for processing the unit input signal into the original signal.
Claim 4
Dependent Claim
89 words
A signal processing unit as claimed in claim 2, characterised in that the additional processing means comprise first calculation means (26) coupled to the selecting means (36, 37) and responsive to the unit input and the current prediction component for carrying out a first predetermined calculation to produce a differential signal; and second calculation means (27) coupled to the first calculation and selecting means (26, 36, 37) and responsive to the differential signal and the prediction component for carrying out a second predetermined calculation to provide the original signal.
Claim 5
Dependent Claim
32 words
A signal processing unit as claimed in claim 3, characterised in that the additional processing means (26, 21, 27) further comprises means (21) for processing the differential signal into a modified signal.
Claim 6
Dependent Claim
48 words
A signal processing unit as claimed in claim 2, characterised in that additional processing means comprises calculation means (82) coupled to the selection means (36, 37) and responsive to the unit input and the current prediction component for carrying out a predetermined calculation to provide the original signal.
Claim 7
Dependent Claim
30 words
A signal processing unit as claimed in claim 5, characterised in that the additional processing means further comprises means (81) for processing the unit input signal into a modified signal.
Claim 8
Dependent Claim
193 words
A signal processing unit as claimed in any of claims 1 to 6, characterised in that the comparing means comprise first comparing means (38) coupled to the third and second predicting means (31, 23) and responsive to the current, the third prediction, and the second prediction components for carrying out a first comparing operation to produce a first control signal (66), and second comparing means (39) coupled to the first predicting means (22) and responsive to the current and first prediction components for carrying out a second comparing operation to produce a second control signal; and in that the selecting means comprise first selecting means (36) coupled to the third predicting means (31), the second predicting means (23), and the first comparing means (38) and responsive to the first control signal to select one of the third and second prediction components to produce a local prediction component, and second selecting means (37) coupled to the first predicting means (22), the first selecting means (36), and the second comparing means (39) and responsive to the second control signal to select one of the first and local prediction components to provide the current prediction component.
References Cited (Backward Citations)
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