Pilot recovery and polarity detection system

Details Pilot recovery and polarity detection system Pilot recovery and polarity detection system

1996-08-02

1997-10-07

Mis, David

Demodulators

Amplitude modulation demodulator

Single or vestigial sideband type

329360, 375317, 375321, 455204, 455214, H03D 100

Patent

active

056752830

ABSTRACT:
A polarity detection circuit for an FPLL demodulated signal including a small DC pilot recovers the DC pilot by determining the DC levels of the demodulated output signals both with and without the DC pilot. A zero carrier condition is created for determining the DC level of the output signal without the DC pilot. The two DC levels are subtracted and limited and the polarity of the recovered DC pilot is used to control the operation of a polarity inverter to assure that the output signal has a desired polarity.

REFERENCES:
patent: 3849730 (1974-11-01), Ho

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