Signal processing unit for producing a selected one of signals predictive of original signals
First Claim
1. A signal processing unit for use in processing an original signal into a prediction signal predictive of said original signal at a current instant, by the use of a local decoded signal produced in relation to a previous instant preceding said current instant said signal processing unit comprising:
- inframe prediction means (22) for carrying out inframe prediction of said original signal by the use of said local decoded signal to produce an inframe prediction signal representative of a result of said inframe prediction;
interframe prediction means (23) for carrying out interframe prediction of said original signal by the use of said local decoded signal to produce an interframe prediction signal representative of a result of said interframe prediction;
background prediction means (31) for carrying out background prediction of said original signal by the use of said local decoded signal to produce a background prediction signal representative of a result of said background prediction;
controlling means (38,
39) coupled to said inframe, said interframe, and said background prediction means for controlling said inframe, said interframe, and said background prediction signals by the use of said local decoded signal to determine an optimum one of said inframe, said interframe, and said background predictions by selecting a minimum one of those absolute values of inframe, interframe, and background prediction errors which are calculated from a difference between said local decoded signal and each of said inframe, said interframe, and said background prediction signals, respectively, and to produce a control signal representative of said optimum one of the inframe, the interframe, and the background predictions; and
selecting means (36,
37) coupled to said controlling means and said inframe, said interframe, and said background prediction means for selecting, as said prediction signal, one of said inframe, said interframe, and said background prediction signals that is determined by said control signal.
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Accused Products
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 is for selecting one of the inframe, the interframe, and the background prediction signals. Therefore, it is possible to produce the prediction signal suitably predictive of the original signal. The signal processing circuit serves equally well in a predictive decoder.
23 Citations
4 Claims
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1. A signal processing unit for use in processing an original signal into a prediction signal predictive of said original signal at a current instant, by the use of a local decoded signal produced in relation to a previous instant preceding said current instant said signal processing unit comprising:
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inframe prediction means (22) for carrying out inframe prediction of said original signal by the use of said local decoded signal to produce an inframe prediction signal representative of a result of said inframe prediction; interframe prediction means (23) for carrying out interframe prediction of said original signal by the use of said local decoded signal to produce an interframe prediction signal representative of a result of said interframe prediction; background prediction means (31) for carrying out background prediction of said original signal by the use of said local decoded signal to produce a background prediction signal representative of a result of said background prediction; controlling means (38,
39) coupled to said inframe, said interframe, and said background prediction means for controlling said inframe, said interframe, and said background prediction signals by the use of said local decoded signal to determine an optimum one of said inframe, said interframe, and said background predictions by selecting a minimum one of those absolute values of inframe, interframe, and background prediction errors which are calculated from a difference between said local decoded signal and each of said inframe, said interframe, and said background prediction signals, respectively, and to produce a control signal representative of said optimum one of the inframe, the interframe, and the background predictions; andselecting means (36,
37) coupled to said controlling means and said inframe, said interframe, and said background prediction means for selecting, as said prediction signal, one of said inframe, said interframe, and said background prediction signals that is determined by said control signal. - View Dependent Claims (2, 3, 4)
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Specification