示例：信号生成

数字电话键盘		高音调组
数字电话键盘		1209 Hz	1336 Hz	1477 Hz	1633 Hz
低	697 Hz	1	2	3	A
音调	770 Hz	4	5	6	B
音调	852 Hz	7	8	9	C
组	941 Hz	*	0	#	D

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