Codec system encoding and decoding an image signal at a high speed

Abstract From the Canadian patent

In a predictive encoder device supplied with an input image signal divisible into odd and even number line signals first and second predictive encoders (32 37) individually carry out predictive encoding of the odd and the even number line signals into first and second encoded signals at a comparatively low speed by the use of first and second local decoded signals respectively. The first and the second local decoded signals are supplied to the second and the first productive encoders through delay circuits (42 43), respectively to predict a current picture element with reference to picture elements located on adjacent lines. Two delay circuits (36 44) are connected to an output, terminal …