We know that the sound spectrum in the range of tens to thousands of cycles per second, if we use program to control an exit line single office machine " high" level or low level, then in the mouth can produce a certain line frequency square wave, connected to the speaker' s voice can be given a certain frequency, if more delay programmed using " high" " low" level the duration of the output frequency can be changed, thus changing the tone

musicplay.docx

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