AM stereo system with modified spectrum

Details AM stereo system with modified spectrum AM stereo system with modified spectrum

1986-07-29

1987-07-14

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 16, H04H 500

Patent

active

046807942

ABSTRACT:
The correction signal of the AM stereo system is filtered through a lowpass filter thus providing compatible signals at all normal modulation levels and frequencies, but allowing the signal to become pure quadrature at high frequency, high modulation levels. The inverse of the process can be utilized in the receivers if desired. The improvement is needed only for narrow channel or restricted sideband broadcasting.

REFERENCES:
patent: 4192968 (1980-03-01), Hilbert et al.
patent: 4332978 (1982-06-01), Streeter
patent: 4371747 (1983-02-01), Hilbert
patent: 4377728 (1983-03-01), Hilbert

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