Dual purpose variable Q filter

Details Dual purpose variable Q filter Dual purpose variable Q filter

1985-12-23

1987-07-14

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 98, H04H 500

Patent

active

046807950

ABSTRACT:
A variable Q filter network in an AM stereophonic receiver provides elimination of any adjacent channel carrier interference while providing the function of a tone control, either automatic or manually controlled. Parts count and costs, IC pinouts and the possibility of intermodulation are all reduced.

REFERENCES:
patent: 4206317 (1980-06-01), Kahn
patent: 4388494 (1983-06-01), Schone et al.
patent: 4430747 (1984-02-01), Streeter
patent: 4486898 (1984-12-01), Yokoya
patent: 4504966 (1985-03-01), Hershberger
patent: 4574389 (1986-03-01), Schotz

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