DTMF

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Intro

DTMF keypad frequencies
	1209 Hz	1336 Hz	1477 Hz	1633 Hz
697 Hz	1	2	3	A
770 Hz	4	5	6	B
852 Hz	7	8	9	C
941 Hz	*	0	#	D

https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling

Goertzel

https://en.wikipedia.org/wiki/Goertzel_algorithm

Stuffs

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