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:
Aug. 25, 1992
Filed:
Jun. 06, 1991
Josephus A Kahlman, Eindhoven, NL;
Wilhelmus J van Gestel, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A device for recording n-bit information words on a magnetic record carrier. A 1-bit digital word is affixed to each successive information word. The resulting (n+1)-bit information words are then encoded in an aT precoder into (n+1)-bit channel words (cW) which are recorded on the record carrier. The 1-bit digital words which are affixed are such that the running digital sum value of the output signal of the precoder has a desired pattern as a function of time. Consequently, for example, a pilot signal can be inserted into the channel word data stream which may be used to control tracking during reproduction of the recorded information from the record carrier. The values of a and n are such that a .gtoreq.2 and n.gtoreq.1. Preferably, n<<1, for example, n.ltoreq.10.