Signal processing unit for producing a selected one of signals predictive of original signals

Abstract From the Canadian patent

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 prodicing an inframe an, interframe, and a background prediction signals respec-, tively. 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 inter-, frame, and the background prediction signals. Therefore it is possible to produce the prediction signal …