| 摘要 |
PURPOSE: An encoding system is provided combining appropriate redundancy and appropriate disparity by dividing a 16 bit input word into 2 eight bit words and mapping respective bytes on a nine bit word. CONSTITUTION: A 16 bit input word is divided into two bytes, namely, into two eight twit words. The respective bytes are mapped on the nine bit word. The map of the respective bytes in mapping depends on the disparity and decision whether the map is inverted or not depends on a digital total (RDS) at the time of operating output. A disparity checker (30) calculates a block digital total BDS0 on an input work x0 and a block digital total BDS1 on an input word x1 and inputs them to an algorithm (35). A loop (40) expresses the feedback of a digital total (RDS) at the time of an execution in the algorithm (35) and the value of feedback is equal to the addition of BDS of output at present to a value just before.
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