AFC apparatus with selection between average value mode and keye

Details AFC apparatus with selection between average value mode and keye AFC apparatus with selection between average value mode and keye

1989-05-24

1990-09-04

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455183, 455192, 455260, H04B 1116

Patent

active

049550748

ABSTRACT:
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 compartor 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.

REFERENCES:
patent: 3934205 (1976-01-01), Bogert
patent: 4099125 (1978-07-01), Bennett, Jr. et al.
patent: 4291332 (1981-09-01), Kato et al.
patent: 4438528 (1984-03-01), Itagaki
patent: 4476584 (1984-10-01), Dages
patent: 4625331 (1986-11-01), Richardson et al.
patent: 4630118 (1986-12-01), Suzuki
patent: 4658438 (1987-04-01), Kamata et al.
patent: 4670776 (1987-06-01), Matsumoto
patent: 4715001 (1987-12-01), Deem et al.

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