A.F.C. system for broad-band FM receiver
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United States of America Patent
Stats
-
Nov 24, 1987
Grant Date -
N/A
app pub date -
Sep 18, 1986
filing date -
Sep 19, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An A.F.C. control system for reception of wide-band F.M. transmission such as satellite transmissions, in which a center frequency of an F.M. I.F. signal is repetitively and alternately compared with an upper and a lower frequency limit value so long as the center frequency lies between these values, with the results of the comparisons being respectively stored in two latch memories, whose contents thereby indicate any error of the center frequency relative to the frequency limits. Any departure of the center frequency from between the limits is corrected by successive frequency shifts of the local oscillator frequency, with the results of correction being indicated by the latch memory contents and with the number of frequency shifts being determined accordingly.
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