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. 13, 1977
Filed:
Feb. 20, 1976
Dietmar Mallon, Zorneding, DT;
Siemens Aktiengesellschaft, Berlin & Munich, DT;
Abstract
A circuit arrangement for decoding a frequency-modulated stereo radio signal includes a FM demodulator followed by a stereo decoder and a matrix. In the matrix, by sum and difference formation, two reproduction signals are formed from a sum signal component of the output signal of the FM demodulator and from a difference signal component which has been converted from an auxiliary carrier frequency state into the audio frequency state by a synchronous demodulator. The stereo decoder is preceded by a correcting amplifier which comprises an operational amplifier having the highest possible amplification and possessing a non-inverting input and an inverting input. The output of the amplifier is fed back by way of a RC element to the inverting input so that a linear frequency response of the sum signal component and the difference signal component is formed.