JPS6472679A - Analogue-digital conversion coding system - Google Patents

Abstract

PURPOSE:To turn objective information into a picture with satisfactory gradation and to display it in a CRT by converting information into a prescribed level range in correspondence with the number of bits corresponding to the desired level range among the number of bits corresponding to all the level ranges of reproduced conversion coding signals so as to attain decoding. CONSTITUTION:A range converter 11 executes a range converting processing so that the dynamic range of the signal of (n) bits which is to be transmitted to a D/A converter 12 comes to the dynamic range of the CRT. If information for (n-1) bits are fetched from (n) bits of reproduced digital signals when the dynamic range of (n) bits of the reproduced digital signals is twofold of the dynamic range of the CRT, the dynamic range becomes similar to that of the CRT. Fetched information for (n-1) bits are converted into (n) bits which is the number of input bits in the D/A converter 12, and they are transmitted to the D/A converter 12. With designating the range to be viewed at the time of reproduction, at least clear reproduction can be executed with picture quality corresponding to original information in correspondence to the objective range.