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:
Jul. 25, 1989
Filed:
Feb. 19, 1988
Shoei Kobayashi, Shinagawa-ku, Tokyo, JP;
Takuya Wada, Shinagawa-ku, Tokyo, JP;
Shinichi Yamamura, Shinagawa-ku, Tokyo, JP;
Other;
Abstract
An apparatus for recording optical cards wherein checking words or inspection words based upon an error correction code are added to information data signals to be recorded, and signals which have been scrambled are recorded in the form of a block that can be optically read onto a belt-like optical recording medium of a card at intervals of a predetermined number of words that are distributed for a data track, and/or an apparatus for reproducing optical cards wherein signals that are read from the thus recorded optical card by a card reader, are descrambled thereby to reproduce the original data signals. Scrambling consists, for example, of so arranging the words that each is delayed by two words in the data track direction and that they are delayed by k tracks, where k is an integer, in the direction perpendicular to the data track, and placing the word at the head of the block at a position of a word number of which the phase is shifted by one word from the word number at the head of the block when the word that has reached the end of the data track is to be wrapped around to the other end and delayed, and then delaying each word by two words in the data track direction.