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:
Sep. 12, 1995
Filed:
Aug. 17, 1993
Kaveh Kianush, Eindhoven, NL;
Engelbertus C Egelmeers, Eindhoven, NL;
Johannes C Meeuwis, Eindhoven, NL;
Hubertus H Vereijken, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Manually tunable analog receivers with AFC have the drawback that the AFC exhibits hysteresis and that in the event of fading pulling to an adjacent station may occur, whereas receivers with PLL electronic tuning have the drawbacks that tuning is comparatively slow and also inaccurate because of the tuning in discrete steps by a microprocessor. The present receiver combines the advantages of both analog manual tuning and electronic tuning. It includes two cooperating frequency loops, one loop (L1) being an AFC loop and the other loop (L2) having a frequency counter (13) for measuring the frequency (f.sub.0) of a tuning oscillator (6) which is controlled by both loops. Cooperation between the loops is provided by a control circuit (16) responsive to control signals supplied by both loops: an in-lock signal (in-1) and an in-window signal (in-w). Preferably, when the desired tuning is achieved, the power to a tuning section (12) of the receiver, forming part of the frequency loop (L2), is interrupted.