Пример. Генерирование сигналов

Клавиатура цифрового телефона		Группа высоких тонов
Клавиатура цифрового телефона		1209 Гц	1336 Гц	1477 Гц	1633 Гц
Низкие	697 Гц	1	2	3	A
Тон	770 Гц	4	5	6	B
Тон	852 Гц	7	8	9	C
Группа	941 Гц	*	0	#	D

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