Demodulation Fsk

May 4th, 2015
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The most commonly used signal parameters for describing an FSK signal are shown in Figure 2. The minimum duration of a mark or space condition is called the element length. Typical values for element length are between 5 and 22 milliseconds, but element lengths of less than 1 microsecond and greater than 1 second have been used.

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Demodulation FskThe Communications Edge Tech-noteAuthor: Bob WatsonFSK: Signals and DemodulationThe most commonly used signal parametersfor describing an FSK signal are shown inFigure 2. The minimum duration of a markor space condition is called the elementlength. Typical values for element length arebetween 5 and 22 milliseconds, but elementlengths of less than 1 microsecond and greaterthan 1 second have been used. Bandwidthconstraints in telephone channels and signalpropagation considerations in HF channelsgenerally require the element length to begreater than 0.5 millisecond. An alternate wayof specifying element length is in terms of thekeying speed. The keying speed in bauds isequal to the inverse of the element length inseconds. For example, an element length of20 milliseconds (.02 seconds) is equivalent toa 50-baud keying speed.Frequency measurements of the FSK signalare usually stated in terms of shift and cen-DATABinary FSK (usually referred to simply asFSK) is a modulation scheme typically usedto send digital information between digitalequipment such as teleprinters and computers. The data are transmitted by shifting the frequency of a continuous carrier in a binarymanner to one or the other of two discretefrequencies. One frequency is designated asthe mark frequency and the other as thespace frequency. The mark and space correspond to binary one and zero, respectively. By convention, mark correspo

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