Patent ID: 6950042
Filing Date: 2005-09-27
Classification: G11B,H03M

Abstract:
1. A modulation apparatus for generating a channel bit string from an input bit string and generating a recording code string or a transmission code string from the channel bit string, comprising: DSV-control-bit generating means for generating a DSV control bit to be inserted into the input bit string in order to control a DSV of the recording code string or the transmission code string; timing adjusting means for adjusting transmission timing for transmitting the input bit string; DSV-control-bit-inserted bit string generating means for generating a DSV-control-bit-inserted bit string by inserting the DSV control bit generated by the DSV-control-bit generating means into a predetermined position of the input bit string whose transmission timing is adjusted by the timing adjusting means; and first modulation means for modulating the DSV-control-bit-inserted bit string generated by the DSV-control-bit-inserted bit string generating means-into the channel bit string on the basis of a conversion rule (d, k; m, n; r), where d is the minimum run length, k is the maximum run length, m is the length of basic data prior to conversion, n is the length of basic channel bits subsequent to conversion and r is the maximum constraint length.