Esempio: generazione del segnale

Tastierino di un telefono digitale		Gruppo toni alta frequenza
Tastierino di un telefono digitale		1209 Hz	1336 Hz	1477 Hz	1633 Hz
Gruppo	697 Hz	1	2	3	A
toni	770 Hz	4	5	6	B
toni	852 Hz	7	8	9	C
bassa frequenza	941 Hz	*	0	#	D

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