Pilot tone detector utilizing phase deviation signals

Details Pilot tone detector utilizing phase deviation signals Pilot tone detector utilizing phase deviation signals

1981-03-20

1983-01-11

Hickey, R. J.

179 1GN, H04H 500

Patent

active

043683568

ABSTRACT:
An AM stereophonic pilot tone is detected using two signals derived from a received broadcast signal. One signal is proportional to the phase deviation and one is a two-level signal which is a function of the magnitude of the phase deviation. The detector controls activation of the visual indicator, muting of the stereo channel of mono/stereo mode switching with almost complete elimination of false detections during monophonic transmission and poor stereo transmission.

REFERENCES:
patent: 3944749 (1976-03-01), Kahn
patent: 4159396 (1979-06-01), Hilbert et al.
patent: 4164623 (1979-08-01), Hilbert et al.
patent: 4249039 (1981-02-01), Fisher et al.
patent: 4255751 (1981-09-01), Hershberger

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