Frequency error detecting apparatus

Details Frequency error detecting apparatus Frequency error detecting apparatus

1991-03-26

1992-09-22

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329303, 375 97, H03D 304

Patent

active

051503824

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.

REFERENCES:
patent: 4574247 (1986-03-01), Jacob
patent: 4616187 (1986-10-01), Watanabe

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