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:
May. 13, 1997
Filed:
Mar. 07, 1996
Toshimitsu Kaku, Sagamihara, JP;
Masahiko Ishimaru, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical disk recording control apparatus includes a judgment circuit for judging a modulation system of user information in accordance with identification information possessed by the optical disk and outputting a control signal concerning the modulation system, a test write pattern generating circuit for generating a test write pattern constituted by the densest and sparsest patterns correspondingly to the code configuration of the identified modulation system, a test write pulse recording circuit for generating a test write pulse string from the test write pattern and recording the test write pulse string in a predetermined zone of the optical disk, an optimum recording power calculation circuit for obtaining optimum recording power for the predetermined zone on the basis of a densest pattern waveform and a sparsest pattern waveform so that the zero level of the densest pattern waveform coincides with the zero level of the sparsest pattern waveform in the test write pulse string recorded in the predetermined zone, and a user information recording circuit for recording the user information into each zone of the optical disk correspondingly to the obtained optimum recording power in accordance with the modulation system, whereby the different modulation system test writing is performed in accordance with the identification information possessed by the optical disk and then the user information is recorded into the optical disk.