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. 22, 2009
Filed:
Nov. 14, 2005
Miodrag Temerinac, Gundelfingen, DE;
Hans Fiesel, Denzlingen, DE;
Miodrag Temerinac, Gundelfingen, DE;
Hans Fiesel, Denzlingen, DE;
Micronas GmbH, Freiburg, DE;
Abstract
In order to suppress interference signals from adjacent TV channels, an intermediate frequency signal is demodulated with a signal (S(f; 0°)) at a video carrier frequency into an in-phase signal, and with a signal (S(f; 90°)) shifted in phase by a phase angle π/relative to the signal (S(f; 0°)) and at a video carrier frequency into a quadrature signal, for example, by an I/Q demodulator. The in-phase signal is filtered by a first Hilbert filter of a Hilbert filter pair having an even symmetrical impulse response in order to obtain a Hilbert-filtered in-phase signal. The quadrature signal is filtered by a second Hilbert filter of the Hubert filter pair having an uneven symmetrical impulse response in order to obtain a Hilbert-filtered quadrature signal. The Hilbert-filtered quadrature signal is added, for example, by an adder to the Hilbert-filtered in-phase signal in order to obtain a video output signal.