Method and apparatus for recovering a payload signal from a signal that has been modulated by frequency shift keying
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United States of America Patent
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Dec 30, 2003
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N/A
app pub date -
Nov 24, 1999
filing date -
Nov 25, 1998
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Abstract
A method and an apparatus are described for recovering a payload signal from an FSK signal that has been modulated by frequency shift keying. From the modulated signal a discrete-time series of sampled values are determined for which the phase difference relative to a preceding sampled value is respectively determined as well. The method and the apparatus can be used in a digital PBX to which the modulated signal is fed via an analog telephone network.
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