Digital FSK transmitter receiver and method of operating same
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United States of America Patent
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May 10, 1994
Grant Date -
N/A
app pub date -
Aug 30, 1991
filing date -
Aug 30, 1991
priority date (Note) -
Expired
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Abstract
A digital FSK receiver includes a zero-crossing detector which detects the zero crossings in an FSK signal having at least two signal frequencies. The time interval between zero crossings is then measured with a first interval value corresponding to one of the signal frequencies and a second interval value corresponding to the other signal frequency. An accumulator outputs a digital signal which depends on whether the interval is at the first value or the second value, the digital signal including logical zeros and ones.
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