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:
Jun. 04, 1996
Filed:
Apr. 05, 1994
Takayoshi Chiba, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An improved apparatus for detecting address information recorded on a recording medium such as an optical-magnetic disc is disclosed. The header information is recorded on each sector of the disc recording medium and is constituted by a sector mark indicating a head position of the corresponding sector, a plurality of address marks, and subsequent address information data. In a first preferred embodiment, a number of bytes starting from an end position of the address information and ending at a head position of the address information is counted and an address information recognition circuit is provided so as to provide an address information recognition start signal for the address information recognition signal at a predicted position of the head position. The address information recognition circuit extracts and recognizes the address information in accordance with the address information recognition start signal supplied from a recognition start signal generator when the address mark detecting circuit does not supply a head position detection signal. In a second preferred embodiment, a window signal used to detect the address mark is selectively changed according to the result of detection of the preceded sector mark and/or address information data.