BIT SYSTEM FOR TRANSMITTING DIGITAL VIDEO DATA

A digital video data transmitting apparatus capable of making a bit stream of video coding due to MPEG-coding having a plurality of picture groups, each having at least one intra picture and a plurality of predictive pictures, and each of the pictures consisting of a least one slice. The apparatus generates a first slice of the I-picture, and a second slice of the P-picture, and then selects the DC coefficient and motion vector from the first and second slices. The selected information is stored in an RS-encoding buffer. One of the generated slices included in the picture is then transmitted into a user data section of the encoded buffer to conform with the MPEG-standard bit stream. Parity data is assigned to the encoded macro block of corresponding slices so that the parity data is transmitted. In accordance with the apparatus, the amount of added information resulting from the error correction codes is greatly reduced by 50% or greater, as compared to conventional methods. Since the amount of saved information can be used again in the process of picture coding, the quality of recovered pictures is improved. Therefore it is also possible to slowly decrease PSNR of recovered pictures despite an increase in CLR and obtain a good picture quality without the presence of B-picture.