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. 18, 1992
Filed:
Jun. 06, 1991
Josephus A Kahlman, Eindhoven, NL;
Kornelis A Schouhamer Immink, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
In a run length limited digital signal of the d,k type, (d+m)-bit digital words are inserted at specific instants in the data stream in a manner such that the signal thus obtained is a run length limited signal of the d,k' type, where k' is greater than or equal to k. This signal is then encoded in an aT precoder, a being an integer such that a .gtoreq.1, and recorded on a magnetic record carrier (21). Such (d+m)-bit digital words are inserted so that the digital sum value of the output signal of the precoder has a desired pattern as a function of time. Thus, for example, a pilot signal can be accommodated in the output data stream of the precoder, which pilot signal can be detected during reproduction of the recorded signal. From this detected pilot signal a control signal can be derived for controlling tracking during reproduction of the recorded signal.