Encoding data are given to a variable-length decoding circuit and are decoded, and are given to a memory so as to be stored therein. The same data are read out from the memory, whereby decoding processing of the encoding data is executed twice within one frame period. Decoding data due to the...http://www.google.com/patents/US5841475?utm_source=gb-gplus-sharePatent US5841475 - Image decoding with dedicated bidirectional picture storage and reduced memory requirements 
