Multivoice signal switching circuit

Details Multivoice signal switching circuit Multivoice signal switching circuit

1985-11-26

1987-12-29

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

358144, H04H 500

Patent

active

047165898

ABSTRACT:
A multivoice signal switching circuit is incorporated in a circuit for demodulating a multivoice signal containing a main channel signal, a first subchannel signal, and a second subchannel signal, the latter two signals being treated for noise reduction. The demodulating circuit comprises a first circuit for extracting a main channel signal from the multivoice signal, a second circuit for extracting a first subchannel signal from the multivoice signal, and a third circuit for extracting a second subchannel signal. The above switching circuit receives the first and second subchannel signals and selectively outputs one of the two subchannel signals, to a decoder where the original signal is restored from the noise reduction treated signal. This signal is fed to an output circuit means together with the outputs of the first circuit, so that an audio signal is reproduced. The switch circuit has a manual switch for selecting either of the first and second subchannel signals, and is adapted to invalidate selection of the second subchannel signal by the manual switch when the second subchannel signal cannot be sensed in the multivoice signal.

REFERENCES:
patent: 4389536 (1983-06-01), Schickedanz

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