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Frequency-shift keying
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==Modulating and demodulating== Reference implementations of FSK modems exist and are documented in detail.<ref>Teaching DSP through the Practical Case Study of an FSK Modem (TI) http://www.ti.com/lit/an/spra347/spra347.pdf</ref> The demodulation of a binary FSK signal can be done using the [[Goertzel algorithm]] very efficiently, even on low-power microcontrollers.<ref>FSK Modulation and Demodulation With the MSP430 Microcontroller (TI) http://www.ti.com/lit/an/slaa037/slaa037.pdf {{Webarchive|url=https://web.archive.org/web/20120406002335/http://www.ti.com/lit/an/slaa037/slaa037.pdf |date=2012-04-06 }}</ref>
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