Demodulating system for high-definition television receiver

Details Demodulating system for high-definition television receiver Demodulating system for high-definition television receiver

1995-01-10

1996-08-20

Kostak, Victor R.

Television

Receiver circuitry

Demodulator

348536, H04N 5455

Patent

active

055483445

ABSTRACT:
A demodulating system for a high definition television (HDTV) that includes a tuning circuit for selecting one out of a plurality of received radio frequency (RF) signals and for converting the selected signal into an intermediate frequency (IF) signal according to an input loop-controlling signal. An oscillating circuit generates a sine wave signal. A filtering circuit passes only a pilot signal containing HDTV carrier information from the IF signal and cancels the remainder. A FPLL circuit for using a predetermined algorithm to form a loop-controlling signal for synchronizing the frequency and phase of the pilot signal and the frequency and phase of the sine wave and providing the loop-controlling signal to the tuning circuit.

REFERENCES:
patent: 4683495 (1987-06-01), Erickson

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