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. 30, 1989
Filed:
Jul. 07, 1987
Theodorus G Martens, Eindhoven, NL;
U.S. Philips Corp., New York, NY (US);
Abstract
A demodulator arrangement including a phase-locked loop PLL (11) having an output (17) coupled to an input (23) of a hold circuit (24) also includes detection means (27) for detecting an instantaneous interference (FIG. 4b) in the signal present at the input (10) of the PLL (11) and for subsequently generating a control signal (FIG. 4e) which is applied to a control input (29) of the hold circuit. The hold circuit is adapted to retain the signal applied to its input (23) during the time interval (T.sub.3) when the control signal is presented to its control input (27). The detection means (27) are adapted to determine a phase-lock error between the signal at the input of the PLL (11) and the signal at the output (20) of a voltage-controlled oscillator VCO (19) associated with the PLL (11) and to generate the control signal if the phase-lock error exceeds a given value, for example, 45.degree.. A better detection of the instantaneous interferences can be realized with such an arrangement in comparison with the use of the amplitude information (if present) of the signal at the input (10) of the PLL (11).