EP0280574A2
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EP
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Method and apparatus for predictive coding
Assignee: Sony Corp
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Filing: 1988-02-26
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Granted: —
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Expires: 2008-02-26
Abstract
Abstract In transmitting a residual signal determined by the difference between an input signal and a predictive signal, a comparative signal based on the input signal is applied to a plurality of predictors having different respective predictive functions or coefficients, the resulting respective predictive output signals from the predictors are compared with the comparative signal to provide respective difference signals, and the predictor corresponding to the smallest of the difference signals with a predetermined time delay, for example, the next preceding sampling of the input signal, is employed as the source of the predictive signal to be subtracted from the input signal for determined the transmitted residual signal.
Inventors
- 👤 Yuichi Kojima
- 👤 Naohisa Kitazato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 17:11
CPC Classifications
H; H03; H03M; H03M7/00; H04; H04N; H04N19/00; H04N19/50; H04N19/503
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
123 words
A predictive encoding method for transmitting a residual signal determined by the difference between an input signal and a predictive signal, comprises the steps of: applying to a plurality of predictors (51-53) having different respective predictive functions a comparative signal based on said input signal; and comparing said comparative signal with each of a plurality of predictive output signals from said predictors (51-53), respectively, so as to obtain a plurality of respective difference signals; characterised by the steps of selecting, with a predetermined time delay, the one of said predictors (51-53) corresponding to the smallest of said difference signals; and subtracting said predictive output signal of said one predictor (51-53) from the current input signal for determining said residual signal to be transmitted.
Claim 2
Dependent Claim
123 words
A predictive encoding method for transmitting a residual signal determined by the difference between an input signal and a predictive signal, comprises the steps of: applying to a plurality of predictors (51-53) having different respective predictive functions a comparative signal based on said input signal; and comparing said comparative signal with each of a plurality of predictive output signals from said predictors (51-53), respectively, so as to obtain a plurality of respective difference signals; characterised by the steps of selecting, with a predetermined time delay, the one of said predictors (51-53) corresponding to the smallest of said difference signals; and subtracting said predictive output signal of said one predictor (51-53) from the current input signal for determining said residual signal to be transmitted.
Claim 3
Dependent Claim
39 words
A predictive encoding method according to claim 1; wherein said input signal represents image information have field and frame intervals; and said predictors include at least an in-field predictor (51), and inter-frame predictor (52) and an inter-field predictor (53).
Claim 4
Dependent Claim
65 words
A predictive encoding method according to claim 1 or 2; in which said input signal is digital data obtained by periodic sampling of an information signal, and said predetermined time delay is equal to a period between successive samplings so that said one predictor (51-53) which is selected for each said sampling corresponds to the smallest of the differences signals for the next preceding sampling.
Claim 5
Dependent Claim
120 words
A predictive decoding method for decoding an original signal from an input residual signal by adding to the latter a predictive signal, comprising the steps of: applying a decoded signal to a plurality of predictors (91-93) having difference respective predictive functions; and comparing said decoded signal with each of a plurality of predictive output signals from said predictors (91-93), respectively, so as to obtain a plurality of respective difference signals; characterised by the steps of selecting, with a predetermined time delay, the one of said predictors (91-93) corresponding to the smallest of said difference signals; and adding to said input residual signal the current predictive output signal from said one predictor (91-93) so as to obtain the decoded original signal.
Claim 6
Dependent Claim
120 words
A predictive decoding method for decoding an original signal from an input residual signal by adding to the latter a predictive signal, comprising the steps of: applying a decoded signal to a plurality of predictors (91-93) having difference respective predictive functions; and comparing said decoded signal with each of a plurality of predictive output signals from said predictors (91-93), respectively, so as to obtain a plurality of respective difference signals; characterised by the steps of selecting, with a predetermined time delay, the one of said predictors (91-93) corresponding to the smallest of said difference signals; and adding to said input residual signal the current predictive output signal from said one predictor (91-93) so as to obtain the decoded original signal.
Claim 7
Dependent Claim
40 words
A predictive decoding method according to claim 4; wherein said input residual signal represents image information having field and frame intervals, and said predictors include at least an in-field predictor (91), an inter-frame predictor (92) and an inter-field predictor (93).
Claim 8
Dependent Claim
71 words
A predictive decoding method according to claim 4 or 5; in which said input residual signal is digital and has a predetermined sampling rate, and said predetermined time delay is equal to a period between successive samplings so that said one predictor which is selected for adding of its current predictive output signal to said input residual signal corresponds, during the next preceding sampling, to the smallest of said difference signals.
Claim 9
Dependent Claim
140 words
A predictive encoder for an input signal comprising: a plurality of predictors (51-53) having different predictive functions, respectively; means (4) for supplying to all of said predictors (51-53) a comparative signal based on said input signal; difference detecting means (57) for detecting differences between said comparative signal and each of a plurality of predictive output signals from said predictors (51-53), respectively, so as to obtain a plurality of respective difference signals; characterised by means (58) for selecting the one of said predictors corresponding to the smallest of said difference signals with a predetermined time delay; and means (54, 2) for providing a residual signal to be transmitted by subtracting, from the current input signal, the predictive output signal then output by said one predictor (51-53) selected on the basis of the smallest of said difference signals delayed said predetermined time.
Claim 10
Dependent Claim
140 words
A predictive encoder for an input signal comprising: a plurality of predictors (51-53) having different predictive functions, respectively; means (4) for supplying to all of said predictors (51-53) a comparative signal based on said input signal; difference detecting means (57) for detecting differences between said comparative signal and each of a plurality of predictive output signals from said predictors (51-53), respectively, so as to obtain a plurality of respective difference signals; characterised by means (58) for selecting the one of said predictors corresponding to the smallest of said difference signals with a predetermined time delay; and means (54, 2) for providing a residual signal to be transmitted by subtracting, from the current input signal, the predictive output signal then output by said one predictor (51-53) selected on the basis of the smallest of said difference signals delayed said predetermined time.
Claim 11
Dependent Claim
38 words
A predictive encoder according to claim 7; wherein said input signal represents image information having field and frame intervals; and said predictors include at least an in-field predictor (51), an inter-frame predictor (52) and an inter-field predictor (53).
Claim 12
Dependent Claim
65 words
A predictive encoder according to claim 7 or 8; in which said input signal is comprised of digital data obtained by periodic sampling of an information signal, and said predetermined time delay is equal to a period between successive samplings so that said one predictor (51-53) which is selected for each said sampling corresponds to the smallest of said difference signals for the preceding sampling.
Claim 13
Dependent Claim
149 words
A predictive encoder according to claim 9; in which said difference detecting means includes latch means (56) arranged to receive said comparative signal and said predictive output signals and to be latched upon each sampling of said input signal, and a difference detecting circuit (57) for receiving said comparative signal and said predictive output signals delayed said period between successive samplings each time said latch means is latched for providing said difference signals therefrom; and said means for selecting includes comparator means (58) receiving said difference signals from said latch means and providing a selector control signal corresponding to the smallest of said difference signals, and a selector circuit (54) connected with said predictors and controlled by said selector control signal to transmit to said means for providing the residual signal the predictive output signal from the predictor which, in the previous sampling, corresponds to said smallest difference signal.
Claim 14
Dependent Claim
53 words
A predictive encoder according to any one of claims 7 to 10; in which said means for supplying a comparative signal based on said input signal includes means for requantitizing said residual signal, and adder means (4) for adding the requantitized residual signal and the predictive output signal from said one selected predictor.
Claim 15
Dependent Claim
124 words
A predictive decoder for decoding an original signal from an input residual signal by adding a predictive signal to the latter, comprising: a plurality of predictors (91-93) having different respective predictive functions; means for applying a decoded signal to said plurality of predictors (91-93); means (96-98) for comparing said decoded signal with each of a plurality of predictive output signals from said predictors (91-93), respectively, so as to obtain a plurality of respective difference signals; means (94) for selecting the one of said predictors corresponding to the smallest of said different signals with a predetermined time delay; and means (8) for adding to said input residual signal the current predictive output signal from said one predictor so as to obtain the decoded original signal.
Claim 16
Dependent Claim
124 words
A predictive decoder for decoding an original signal from an input residual signal by adding a predictive signal to the latter, comprising: a plurality of predictors (91-93) having different respective predictive functions; means for applying a decoded signal to said plurality of predictors (91-93); means (96-98) for comparing said decoded signal with each of a plurality of predictive output signals from said predictors (91-93), respectively, so as to obtain a plurality of respective difference signals; means (94) for selecting the one of said predictors corresponding to the smallest of said different signals with a predetermined time delay; and means (8) for adding to said input residual signal the current predictive output signal from said one predictor so as to obtain the decoded original signal.
Claim 17
Dependent Claim
39 words
A predictive decoder according to claim 12; wherein said input residual signal represents image information having field and frame intervals, and said predictors include at least an in-field predictor (91), an inter-frame predictor (92) and an inter-field predictor (93).
Claim 18
Dependent Claim
71 words
A predictive decoder according to claim 12 or 14; in which said input residual signal is digital and has a predetermined sampling rate, and said predetermined time delay is equal to a period between successive samplings so that said one predictor (91-93) which is selected for adding of its current predictive output signal to said input residual signal corresponds, during the nest preceding sampling, to the smallest of said difference signals.
Claim 19
Dependent Claim
144 words
A predictive decoder according to claim 14; in which said means for obtaining said difference signals includes latch means (96) receiving said decoded signal and said predictive output signals and being latched upon each sampling of said input signal, and a difference detecting circuit receiving said decoded signal and said predictive outputs signals delayed said period between successive samplings each time said latch means is latched for providing said difference signals therefrom; and said means for selecting includes comparator means (97) receiving said difference signals from said latch means and providing a selector control signal corresponding to the smallest of said difference signals, and a selector circuit (94) connected with said predictors and controlled by said selector control signal to transmit to said means for adding the predictive output signal from the predictor which, in the previous sampling, corresponds to said smallest difference signal.
References Cited (Backward Citations)
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