Polarity selection circuit for bi-phase stable FPLL

Details Polarity selection circuit for bi-phase stable FPLL Polarity selection circuit for bi-phase stable FPLL

1995-07-10

1997-04-15

Lee, Michael H.

Television

Receiver circuitry

Demodulator

375327, 375332, 329304, H04N 5455

Patent

active

056214839

ABSTRACT:
A television receiver includes a synchronous demodulator including a bi-phase stable PLL for controlling sampling of the received signal to produce data. A phase inverter reverses the phase of the data in response to a control signal. Data segment sync characters are recovered with a sync correlation filter that also yields a sign bit indicating polarity. If the sign bit is wrong for a predetermined number of data segment sync characters, a control signal is produced to operate the phase inverter.

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