Data stream decoder e.g. for picture, video and film information

摘要

The decoder includes a control unit and a data processor which decodes a data stream and performs block to raster conversion. A signal processor calculates inverse quantisation, inverse cosine transformation, frame reconstruction and colour space conversion. The data and signal processors and an internal memory are linked to an external memory access. The signal processor includes arithmetic and multiplexer units but no programme controlled central microprocessor. The signal processor includes separate independent controllers for each process being performed. The control unit coordinates digital picture signal processed by sending start signals to the processors.