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voice
- 用声卡进行数据采集,产生一正弦波,计算机通过扬声器把此正弦波用声音的形式发出;用话筒,把声音采集,然后比较这两种信号(Using sound card to collect data and produce a sine wave, the computer sends out the sine wave in the form of sound by means of loudspeaker, and uses microphone to collect the sound, then com