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:
Sep. 14, 1999
Filed:
Oct. 24, 1997
Chiaki Nonaka, Kanagawa, JP;
Masahiro Shigenobu, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A modulation device and a demodulation device suitably performing DSV control while reducing the size and lowering the price of the hardware. Recording data is modulated at a modulator. In a DSV calculator, the DSV value of a modulated data is calculated in units of 1 DSV frame. A comparator outputs a sign comparison result of a DSV value cumulatively added from the start of recording and a DSV value to a DSV control bit insertion unit. The DSV control bit insertion unit inserts bits of DSV control data in accordance with the comparison result at a predetermined insertion position of the modulated data delayed by exactly an amount of 1 DSV frame. Thereafter, the modulated data is subjected to NRZ modulation.