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:
Nov. 05, 2013
Filed:
Jul. 14, 2011
Hiroshi Shimada, Kanagawa-ken, JP;
Hiroshi Shimada, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, a circuit for generating a signal has an amplifier, first and second detection circuits, first and second A/D converters, and a digital signal processing circuit. The amplifier amplifies an electric signal corresponding to an intensity of a reflected light from an optical disc. The first detection circuit detects an upper envelope of an output signal from the amplifier, and outputs an upper envelope signal. The second detection circuit detects a lower envelope of an output signal from the amplifier, and outputs a lower envelope signal. The first A/D converter converts the upper envelope signal into a first digital signal. The second A/D converter converts the lower envelope signal into a first digital signal. The digital signal processing circuit performs calculation processing of the first and the second digital signals, and outputs a signal for controlling reproduction of data recorded on the optical disc.