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. 20, 2003
Filed:
Oct. 25, 2000
Matsushita Electric Industrial Co., Inc., Osaka, JP;
Abstract
Spiral tracks are formed on a recording surface of an information disk such as an optical disk, and data is recorded by interleaving technique as well as adding error correction information. A disk driver rotates the information disk at a specified speed. Plural tracks are read simultaneously by a reading device. Analog data of the plural lines are converted into digital data by an A/D converter, and stored in a frame data buffer memory by each line. The data are respectively decoded sequentially in a decoder. When the disk makes one rotation, the data of next track is read in duplicate as much as the portion of the interleaving length of the tail data of each one of the plural tracks being read on the information disk. By data aligning means, according to a command from a controller, the data—corresponding to the number of tracks that can be read simultaneously—being output in parallel from the decoder are aligned sequentially from the head data on the information disk. The data corresponds to the number of tracks that can be read simultaneously. The data output means outputs valid data out of the data aligned by the data aligning means to the outside of the device by the command from the controller.