Frequency error detecting apparatus
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United States of America Patent
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Sep 22, 1992
Grant Date -
N/A
app pub date -
Mar 26, 1991
filing date -
Jun 20, 1990
priority date (Note) -
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Abstract
A frequency error detecting apparatus for an FSK signal communication system in which data symbols are represented by frequencies displaced from a center frequency, includes a counter for counting the number of each type of data symbol in a received signal over a specific period of time, and a multiplier for multiplying the counted number of symbols by the displacement frequency for each symbol to produce a correction value. A counting unit counts the total number of cycles of the received signal over the specific time period to output a counted number which is proportional to the center frequency of the received signal. The correction value is subtracted from this counted number so that a corrected center frequency may be produced which is then compared with the internal center frequency of the receiver, so that a frequency error may be determined.
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