DEVICE FOR CODING SIGNALS REPRESENTATIVE OF A SEQUENCE OF PICTURES AND SYSTEM FOR TRANSMISSION OF HIGH DEFINITION TELEVISION PICTURES INCLUDING SUCH A DEVICE

摘要

PCT No. PCT/NL89/00023 Sec. 371 Date Jan. 16, 1990 Sec. 102(e) Date Jan. 16, 1990 PCT Filed Apr. 17, 1989 PCT Pub. No. WO89/10039 PCT Pub. Date Oct. 19, 1989.A high definition image transmission system comprising a stage for the transmission of encoded data representative of images and, after transmission of these data at a specific field frequency and by a first channel having a limited passband, a stage for receiving the transmitted data. The transmission stage comprises an image encoding device having three processing channels in parallel for the purpose of transmission, at three separate transmission rates, of one or another of these three channels depending on the output signal of a decision circuit. It further comprises a device for decoding the encoded data, comprising three processing branches located in parallel and each receiving the sequence of the encoded data and a circuit for routing the outputs of the said branches according to the output signal of the decision circuit transmitted to the decoding device by a second channel called the digital assistance channel. Each branch comprises in series, a dynamic interpolation circuit and a spatial filtering circuit and one of the branches also comprises in series, a circuit for reconstructing images from the transmitted encoded data and from data representative of the motion of the original images.