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Talk:Multiple frequency-shift keying

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I've got a problem with the image shown in this article : I found it on http://www.qsl.net/zl1bpu/MFSK/ with a copyright. Perhaps this image is copyright violation ?Flying jacket 11:54, 30 March 2007 (UTC)[reply]

Is DTMF a kind of MFSK?

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My understanding is that DTMF is *not* a kind of MFSK. The MFSK used by ham radio operators[1] always transmits one tone at a time. DTMF transmits 2 tones simultaneously. So ... should we clarify in the article that DTMF is *not* a kind of MFSK ? Or have I misunderstood what MFSK is ? What is the technical term for "kinds of modulation that use 2 or more simultaneous tones, including DTMF and COFDM"? --75.19.73.101 (talk) 08:31, 13 December 2007 (UTC)[reply]

I believe the proper designation for DTMF and ICAO SelCal is either F2DE or A2DE, depending on the basic modulation, FM or AM. Per ITU rules described in Types of radio emissions:
2 is for One channel containing digital information, using a subcarrier
D is for Telecommand
E is for Multi-condition code, one condition per "signal element"
Sv1xv (talk) 11:57, 7 January 2008 (UTC)[reply]
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