ENCODER, DECODER AND DATA CONVERTER HAVING THE SAME

摘要

PURPOSE:To reduce the circuit scale and the processing quantity by constituting the device such that the horizontal direction signal is synthesized at the final stage. CONSTITUTION:A data split and coded into 4 bands is written in a buffer memory 15 via an address switching circuit 3 with an address of a write address generating circuit 2. As to LL and LH bands, a vertical interpolation high frequency processing circuit 6 applies vertical interpolation. The data subjected to interpolation processing is added by an adder circuit 7 and written in the memory 15. The data read from the memory 15 is interpolated respectively by a horizontal interpolation low frequency processing circuit 12 and a horizontal interpolation high frequency processing circuit 13 respectively, added by the circuit 7 and outputted to a display device 14. Then the output is given to the device 14 while applying synthesis processing and a memory of full size is not required, and then the circuit scale and th processing quantity are reduced.