Broadcast signal detected indication system

Details Broadcast signal detected indication system Broadcast signal detected indication system

1986-09-02

1987-12-08

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 12, 455166, H04H 500

Patent

active

047122412

ABSTRACT:
In a radio having an in phase multiplier (A) for providing an in phase detected signal, a detection unit for receiving this signal and for determining whether this signal includes any negative polarity components which would indicate that a viable broadcast signal does not exist on the incoming frequency of interest. This detection unit can include a comparator (11) for comparing the incoming signal against a selected reference value. The invention can also include a signal quality evaluation unit (58) for providing either a digital or analog quality signal that can also effect the output and be used by appropriate processing circuitry to further refine the channel selection process.

REFERENCES:
patent: 3582794 (1971-06-01), Smith
patent: 4504966 (1985-03-01), Hershberger
patent: 4606075 (1986-08-01), Eastmond

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