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

摘要

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 predictive 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 (32c) of the first predictive encoder and to an input terminal (37a) of the second predictive encoder to adjust timings of the first and the second encoded signals. A predictive decoder device also comprises first and second predictive decoders (62, 63) corresponding to the first and the second predictive encoders.