Moving-picture signal coding and/or decoding system resistant to transmission error

Abstract

An input image signal is coded by an encoder to be outputted as a basic code string, and the basic code string is delayed by a code-string delay circuit for a predetermined period of time to be outputted as an additional code string. The basic code string is synthesized with the additional code string by a code-string synthesizer to be outputted as an output code string. Thus, there is provided an image data coding system which can quickly restore data even if the data is lost due to error and in which the increased code amount is less than the cycle refresh and the error correction.

1. An image data signal for transmitting encoded image information in an output code string, said output code string comprising:
 an encoded image stream including a code string composed of a synchronization code;   a basic code string obtained by coding an input image signal;   a discrimination code which is different from the synchronization code; and   an additional code string including at least a part of said basic code string.   
     
     
       2. An image data signal according to  claim 1 , wherein the output code string is embodied in a signal transmitted between computers. 
     
     
       3. An image data signal according to  claim 1 , wherein the output code string is embodied in a radio frequency signal transmitted between computers. 
     
     
       4. An image data signal for storing encoded image information as an output code string in a computer readable medium, said output code string comprising:
 an encoded image stream including a code string composed of a synchronization code;   a basic code string obtained by coding an input image signal;   a discrimination code which is different from the synchronization code; and   an additional code string including at least a part of said basic code string.   
     
     
       5. An image data signal according to  claim 4 , wherein the output code string is embodied in a signal transmitted between computers. 
     
     
       6. An image data signal according to  claim 4 , wherein the output code string is embodied in a radio frequency signal transmitted between computers. 
     
     
       7. An image data signal for transmitting encoded image information in an output code string, said output code string comprising:
 an encoded image stream including a code string composed of a first synchronization code;   a basic code string obtained by coding an input image signal;   a second synchronization; and   an additional code string including at least a part of said basic code string.   
     
     
       8. An image data signal according to  claim 7 , wherein the output code string is embodied in a signal transmitted between computers. 
     
     
       9. An image data signal according to  claim 7 , wherein the output code string is embodied in a radio frequency signal transmitted between computers. 
     
     
       10. An image data signal for storing encoded image information as an output code string in a computer readable medium, said output code string comprising:
 an encoded image stream including a code string composed of a first synchronization code;   a basic code string obtained by coding an input image signal;   a second synchronization; and   an additional code string including at least a part of said basic code string.   
     
     
       11. An image data signal according to  claim 10 , wherein the output code string is embodied in a signal transmitted between computers. 
     
     
       12. An image data signal according to  claim 10 , wherein the output code string is embodied in a radio frequency signal transmitted between computers. 
     
     
       13. A video signal encoding method comprising:
 dividing frames, which compose a video signal, into a plurality of blocks;   generating first encoded data, which includes first encoded blocks obtained by encoding the plurality of blocks;   generating second encoded data, which includes second encoded blocks obtained by encoding the plurality of blocks, to be used by a decoding process if the first encoded data has not been decoded correctly; and   combining the first encoded data and the second encoded data so as to be combined encoded data, wherein the combining further combines a synchronization code with the first encoded data and the second encoded data.    
     
     
       14. A video signal encoding method comprising:
 dividing a frame contained in a video signal into a plurality of blocks;   generating first encoded data, which includes first encoded blocks obtained by encoding the plurality of blocks;   generating second encoded data, which includes second encoded blocks obtained by encoding the plurality of blocks, to be used by a decoding process if the first encoded data has not been decoded correctly; and   combining the first encoded data, the second encoded data, and a synchronization code so as to output combined encoded data.