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:
Jan. 09, 1996
Filed:
May. 05, 1994
Joachim Brilka, Hamburg, DE;
Wolfgang Weltersbach, Hamburg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
A circuit arrangement for demodulating the sound signals in a television signal is described, which circuit arrangement ensures a simple and low-cost structure, also for operation at different transmission standards. To this end, the circuit arrangement according to the invention includes an oscillation-generating stage which derives a (first) oscillation from a television signal (IF television signal) modulated on a first intermediate-frequency carrier oscillation, whose frequency corresponds to the frequency of an intermediate-frequency picture carrier oscillation in the IF television signal and encloses a phase angle of at least substantially 90.degree. with the picture carrier oscillation, a (first) mixer stage, a first input of which can receive the (first) oscillation, and a switching device for optionally applying the IF television signal or a sound signal (IF sound signal) modulated on a second intermediate-frequency carrier oscillation to a second input of the (first) mixer stage.