H - Electricity
03
J
325/106, 365/3
H03J 7/06 (2006.01) H04N 5/50 (2006.01) H04N 7/045 (2006.01)
Patent
CA 1322024
ABSTRACT OF THE DISCLOSURE An AFC apparatus effectively used for a satellite broadcasting receiver and making up a tuning circuit of frequency synthesizer system using a phase- locked loop (PLL) is disclosed, in which a frequency error detector for detecting an error of an output signal of a demodulator from the central frequency comprises first and second comparators supplied with an output of the demodulator and reference voltages, a first latch circuit for latching an output of the first comparator by a key pulse, and a second latch circuit for latching an output of the second comparator by a key pulse. A demodulation output is thus accurately held to realize an accurate data comparison even against a key pulse of a large duty factor.
600917
Marks & Clerk
Matsushita Electric Industrial Co. Ltd.
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