frequency shift keying FSK

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Ashsas

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Could some one give me a detailed explantion of the functionality of a frequency shift keying (FSK) cheers Ash.
 
from http://www.webopedia.com/TERM/F/FSK.html

FSK Last modified: Thursday, March 21, 2002

Short for frequency-shift keying, a modulation technique used by modems in which two different frequencies in the carrier signal are used to represent the binary states of 0 and 1. Using FSK, a modem converts the binary data from a computer into a binary form in which logic 1 is represented by an analog waveform at a specific frequency and logic 0 is represented by a wave at a different specific frequency.
 
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