Method and system for signalling additional information by AM me

Details Method and system for signalling additional information by AM me Method and system for signalling additional information by AM me

1985-04-25

1987-07-07

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 15, H04H 500

Patent

active

046792384

ABSTRACT:
To permit transmission of traffic information by amplitude modulation in the medium wave band without disturbing audio signals being broadcast, a stereo pilot tone of frequency f.sub.pt below audible range is generated, as well as first and second sinusoidal signals of f.sub.1 =m.sub.1
.multidot.f.sub.pt and f.sub.2 =m.sub.2
.multidot.f.sub.pt, in which m.sub.1, m.sub.2, and n are different integers. The carrier is modulated by the stereo pilot tone and the first and second sinusoidal signals in such a manner that the phases thereof are different and further, when added, they do not essentially exceed the amplitude of the stereo pilot tone.

REFERENCES:
patent: 4388493 (1983-06-01), Maisel
patent: 4420658 (1983-12-01), Loughlin
patent: 4489411 (1984-12-01), Snedkund
patent: 4534054 (1985-08-01), Maisel

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