Ejemplo: generación de señales

Teclado de teléfono digital		Grupo de tonos altos
Teclado de teléfono digital		1209 Hz	1336 Hz	1477 Hz	1633 Hz
Bajo	697 Hz	1	2	3	A
de tonos	770 Hz	4	5	6	B
de tonos	852 Hz	7	8	9	C
bajos	941 Hz	*	0	#	D

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