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:
Feb. 21, 1995
Filed:
Jun. 06, 1994
Shinichi Okada, Tokorozawa, JP;
Kyota Funamoto, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
Disclosed is an information recording/reproducing apparatus using an optical recording medium, which can reproduce information from a recording medium designed to have a high linear recording density, by a method of performing signal separation/extraction by one threshold level in a level detecting process at the time of information reproduction from an optical recording medium with a high linear recording density. The information recording apparatus comprises a data converting means for perform data conversion on record information consisting of a digital signal in accordance with a predetermined data conversion table including a pattern for yielding a converted pattern consisting of at least one '0' and an even number of consecutive '1' or a converted pattern having a section consisting of '01010' and a section consisting of at least one '0' or an even number of consecutive '1'; a data modulating means for inverting an initial output signal when bit information of data after the data conversion is '1' given that the initial output signal is '0'; and a recording means for recording the output signal on an optical recording medium. The information reproducing apparatus comprises a reading means for reading information from the optical recording medium to yield a reproduced signal; a level detecting means for detecting a level of the reproduced signal and outputting digital data; an error correcting means for, upon detection of a sequence of '01110' in a bit pattern of the digital data, correcting the sequence to a sequence of '01010' and outputting corrected data, and, upon detection of no error, outputting the digital data; and a data reverse converting means for performing reverse conversion on the output data of the error correcting means in accordance with the data conversion table, yielding reproduced information.