Patent ID: 6677867
Filing Date: 2004-01-13
Classification: H04N

Abstract:
A data conversion circuit for converting intended input data into output data using a look-up table for conversion which defines correspondences between input and output, the data conversion circuit comprising:an adder for adding â€œ1â€  to first table input data which is upper bit data having a bit length corresponding to an input format of said look-up table for conversion among said input data, to yield second table input data; a look-up table storage memory for storing said look-up table for conversion, for outputting first table output data associated with said first table input data using the look-up table for conversion, as well as outputting second table output data associated with said second table input data using the same said look-up table for conversion; and a weighting operation part for performing a weighting operation on said first table output data and said second table output data based on lower bit data excluding said predetermined bit number of upper bit data among said input data, interpolating between each of said table output data, and calculating output data having a bit length which is longer than that of said first table output data and said second table output data, wherein said look-up table storage memory is a dual port memory to which said first table input data and said second table input data are inputted simultaneously, and from which said first table output data and said second table output data are outputted simultaneously.