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:
Dec. 24, 1985
Filed:
Apr. 03, 1985
Dieter Janta, Hamburg, DE;
Wolfgang Nolde, Hamburg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
A demodulator circuit for demodulating a signal which varies substantially sinusoidally with time, such as a stereo signal having a carrier frequency, comprises a mixer circuit having a first input with a linear transfer characteristic which receives the stereo multiplex signal u.sub.m to be demodulated and having a second input with a substantially hyperbolic tangent transfer characteristic, the second input receiving a signal u.sub.d. The signal u.sub.d is a voltage having a triangular wave shape superimposed with the triangular wave shape having the carrier frequency. A stereo output signal L and R is produced having minimal third and fifth harmonics of the carrier frequency is produced from a matrix circuit as a result of the triangular shape and amplitude of the signal u.sub.d.