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. 25, 2005
Filed:
Mar. 15, 2001
Yutaka Kashihara, Fuchu, JP;
Yutaka Okamoto, Chofu, JP;
Chosaku Noda, Kawasaki, JP;
Hideo Ando, Hino, JP;
Koichi Hirayama, Yokohama, JP;
Yutaka Kashihara, Fuchu, JP;
Yutaka Okamoto, Chofu, JP;
Chosaku Noda, Kawasaki, JP;
Hideo Ando, Hino, JP;
Koichi Hirayama, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An estimation method produces a reproduction signal while reading from an information recording medium such as an optical disk, and uses an equalizer to produce an equalization signal. The method then synthesizes distribution levels of the equalization signal that range over distributions of (n+1) levels L, L, . . . , Ln (in which L<L. . . <Ln and n>2), thereby creating a new distribution. The method then uses the standard deviation of the new distribution as an estimation reference value to estimate the quality of an information reproduction apparatus or the quality of the information recording medium. The quality estimate may be used to adjust a circuit in an information reproduction apparatus that reads the information recording medium.