The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 1991
Filed:
Mar. 23, 1989
Kenichi Hase, Fujisawa, JP;
Shyoichi Miyazawa, Yokohama, JP;
Ryutaro Horita, Yokohama, JP;
Shinichi Kojima, Takasaki, JP;
Akira Uragami, Takasaki, JP;
Takashi Watanabe, Takasaki, JP;
Yoshinori Yoshino, Takasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Microcomputer Engineering Ltd., Tokyo, JP;
Abstract
When data are memorized in a 2-7 RLL code on a disc shaped memorizing medium using a sector format, as an address mark in each sector a 2-7 illegal pattern is used; a 1-byte data '8B' in an NRZ signal is converted into a 2-7 RLL code, and further it is modified into the 2-7 illegal pattern. A disc controller in a disc memory inserts the 1-byte data '8B' into a specified position in an NRZ signal and transmits it to an encoder/decoder. In the encoder, the 1-byte data '8B' in an NRZ signal is detected, and a 2-7 illegal pattern is formed by reversing a specified bit of a 2-7 RLL code formed by converting the 1-byte data '8B', and the illegal pattern is sent to the read/write amplifier.