Method for encoding binary data

TL;DR: In this paper, the authors proposed to improve recording density on a recording medium by referring data before and after 2-bit data and a code word before a 5-bit code word when converting binary data into the 5-bits code word.

Abstract: PURPOSE:To set up a minimum value to 4 and a maximum value to a prescribed value or less and to improve recording density on a recording medium by referring data before and after 2-bit data and a code word before a 5-bit code word when converting binary data into the 5-bit code word in each 2-bit data. CONSTITUTION:Original data from an input terminal 1 and a clock from a clock input terminal 2 are inputted to a 12-bit serial/parallel shift register 3, which shifts the input data sequentially and applies its outputs Q1-Q12 to an encoder 4. Encoded algorithms decided by a condition deciding circuit 9 to which the outputs of a 10-bit serial/parallel shift register 8 are inputted are applied to the encoder 4. The encoder 4 applies outputs obtained by encoding input data by prescribed algorithm to a 5-bit parallel/serial register 7. While referring the data before and after the 2-bit data and the code word before the 5-bit code word, the minimum value of the number of continuous ''1''s and the succeeding ''0''s in the converted 5-bit code word string is set up 4 and the maximum value is set up the prescribed value or less.