Patent ID: 6108149
Filing Date: 2000-08-22
Classification: G11B

Abstract:
A digital data transmitting apparatus for transmitting digital data corresponding to a partial response method, the apparatus comprising:data converting means for converting input data of which one word is composed of m bits (where m is an integer) into conversion data of which one word is composed of n bits (where n is an integer that satisfies the relation of n>m) so that when the conversion data is pre-coded corresponding to the partial response method, reversing intervals of the signal polarity of the conversion data become a predetermined value or less, wherein said conversion data is selected according to the following protocol:(1) the number of bits of said input data to be evaluated for selecting said conversion data includes said n bit word, and .alpha. bits from a prior word as the higher order bits of said input data;(2) any input data to be evaluated that results in the same signal polarity for said conversion data of a predetermined number of bits or greater is excluded; and(3) any code to be evaluated that results in the same signal polarity for consecutive bits between consecutive conversion data of a predetermined number of bits or greater is excluded;pre-coding means for pre-coding the conversion data corresponding to the partial response method; andtransmitting means for transmitting an output of said pre-coding means to a receiving side.