Circuit arrangement for decoding a frequency modulated stereo ra

Details Circuit arrangement for decoding a frequency modulated stereo ra Circuit arrangement for decoding a frequency modulated stereo ra

1976-02-20

1977-12-13

Olms, Douglas W.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330109, H04H 500

Patent

active

040630420

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.

REFERENCES:
patent: 3432764 (1969-03-01), Kermicle
patent: 3798376 (1974-03-01), Limberg
patent: 3805178 (1974-04-01), Rollett
patent: 3829626 (1974-08-01), Irwin et al.

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