A high definition television coding arrangement with graceful degradation

摘要: Graceful degradation for digitally encoded HDTV signals is achieved by appropriately coding the image to provide a controllable of chosen characteristics, such as temporal degradation, spatial and dynamic range degradation. In approach this invention, resolution movement suffers when noise introduced. approach, sacrificed. The graceful dividing transmitted signal into two or more parts, parts A, B C. Part A given heaviest error-correcting code; part "medium" error correcting C least powerful code (or perhaps none at all). receiver that close transmitter most likely receives farther away gets noisier might and, perhaps, correctly receive only B. limits A. Of course, are constructed in hierarchical fashion so provides basic information; augments information produce better picture; plus highest picture.