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:
Jan. 23, 1996
Filed:
Oct. 18, 1993
Kazutoshi Shimizume, Kanagawa, JP;
Shinobu Nakamura, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A modulator suppressing a low-frequency component of a recording waveform while limiting maximum and minimum recording wavelengths, comprising a margin bit generating circuit for generating a most suitable margin bit pattern based on a signal concerning a final recording waveform level of each of n channel bit patterns to be put before a margin bit pattern to be inhibited, control signals concerning a polarity of a cumulative digital sum variation, a control signal coming from a digital sum variation integrating circuit to switch between gains by detecting a magnitude of an absolute value of the digital sum variation, and a signal concerning the cumulative digital sum variation of each of the n channel bit patterns to be put after the above-mentioned margin bit pattern.