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. 15, 2001
Filed:
Jun. 18, 1998
Adrianus Van Bezooijen, Eindhoven, NL;
Evert D. Van Veldhuizen, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A digital receiver has a local oscillator that provides a local oscillator signal, a frequency offset detector that provides a frequency offset signal that is representative of a difference between the local oscillator signal and a desired tuning frequency of the digital receiver, and a frequency controller that controls the frequency of the local oscillator on the basis of a stored control value. The frequency controller separately derives a short term drift compensation signal and a long term drift compensation signal from the frequency offset signal, at a first interval updates the stored control value on the basis of the derived short term drift compensation signal, and at a second interval updates the stored control value on the basis of the long term drift compensation signal. The first interval is substantially shorter than the second interval.