Understanding Frequency Shift Keying

This video explains the fundamental concepts behind frequency shift keying (FSK) and the common variants and applications of FSK signals.
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[@danielaesmaili2391]

Thank you so much. It made 2-FSK, 4-FSK very clear to me. Great animations and well done!

[@marcusazevedo8204]

These videos is so awesome! Thanks for that!

[@thrupthishetty896]

This is a real nice explanation

[@darylw-m9549]

Nice explanation; thank you.

[@lazarocamargo]

Excellent tutorial, thanks!!!

[@pauldenisowski]

Thanks!

[@JacobKinsley]

7:20 The noise the wasp makes when you spray it with half a bottle of febreeze

[@pauldenisowski]

(laughs) Actually, a lot of the different FSK modulation schemes have very distinctive sounds -- after a while you can identify many of them just by listening to the pattern of "tones"

[@tedtdu]

The deviation is equal, numerically, to one-half of the shift.

[@TheCasualSirenEnthusiast]

the Emergency Alert System (EAS) I just found out uses FSK tones for the beginning/end tones

[@interloperger2651]

Yep. Modems use them aswell.

[@fbar07]

So, I have always heard M-ary FSKs referred to as MFSKs, with higher order FSKs referred to as 4MFSK, 8MFSK, etc. Why is this not as accurate? Thank you!

[@pauldenisowski]

(laughs) That's what happens when I go off-script when I'm recording. :) For consistency, I (try to) always refer to digital modulation schemes as modulation order + type. So I would say things like 8PSK, 16APSK, 64QAM, etc. Using this convention, higher order FSK modulation schemes would be 8FSK, 16FSK, etc. No one says "8MPSK" or "64MQAM" - the number indicates they have more than two (M-ary) states, so in my opinion the 'M' is redundant. There is also a something called "minimum shift keying," abbreviated "MSK," so that could ... potentially ... be confusing. [MSK is actually rarely found as "pure MSK" but rather in things like GMSK] But in all honesty, there are lots of people, myself sometimes included, who refer to 16FSK as "16M(F)SK" and that's completely fine. In fact, I would say that "16MSK" is probably a more common abbreviation than "16FSK," so please don't take my offhand comment too seriously :) Thanks for a great question!