Arrangement for decoding a stereo multiplex signal

Details Arrangement for decoding a stereo multiplex signal Arrangement for decoding a stereo multiplex signal

1987-11-30

1989-08-22

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 10, 381 11, 331 25, H04H 500

Patent

active

048603546

ABSTRACT:
Arrangement for decoding a stereo multiplex signal, having a baseband stero signal (L+R), a stereo difference signal (L-R) which is amplitude-modulated on a suppressed sub-carrier, and a pilot signal having a frequency located between the frequency bands of the two signals, the arrangement having an input for the stereo multiplex signal and left and right stereo signal outputs, the input being coupled both, via a pilot selection circuit, to a phase-locked loop for regenerating the sub-carrier and to a multiplier circuit for multiplying at least the modulated stereo difference signal by the regenerated sub-carrier. In order to improve the stereo channel separation, the pilot selection circuit includes a bandpass filter of the switched capacitor type, a clock input of which is coupled to an output of an voltage-controlled oscillator incorporated in the loop. A mono-stereo control can be realized therein in a simple manner by varying the phase transfer of the switched capacitor bandpass filter at least at the pilot frequency in dependence upon a mono-stereo control signal.

REFERENCES:
patent: 4419541 (1983-12-01), Kishi et al.
patent: 4569072 (1986-02-01), van Roermund
patent: 4626796 (1986-12-01), Elder

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