| 摘要 |
<p>A YUV-RGB digital conversion circuit capable of reducing the scale of a circuit is provided. A YV-R conversion circuit of the YUV-RGB digital conversion circuit for converting a digital luminance signal Y and digital color-difference signals U and V into digital color signals R, G, and B approximately expands a coefficient 1.371 of R = Y + (V-128) x 1.371 to a finite number of terms of 2<-n> (n is a natural number) and computes an R signal. The YV-R conversion circuit includes a plurality of bit-shift circuits 42, 46, 50, 52, and 56 for bit-shifting an input signal and outputting an input signal x 2<-k> (k is a natural number such that k </= n). Also, it includes a plurality of adders 44, 48, 54, 58, 60, and 62 for performing the addition of the terms of two sets of input signal x 2<-k> whose value of the multiplier k is different. Of these adders, the addition of a plurality of sets such that a first-power difference is formed is shared by one adder 44. Also, the plurality of adders are connected so as to perform the addition of the terms corresponding to a smaller term from among a plurality of terms of 2<-n> with priority, and when the output of the adder of a previous stage is bit-shifted by a bit-shift circuit, a plurality of additions are performed while dropping the low-order bits such that there is no addend to be added after the addition by the adder of the next stage. <IMAGE></p> |
