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- 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,得到最终结果,验证一下(Sound card is used to collect data and generate a sine wave. The computer sends out the sine wave in the form of sound through the loudspeaker, and the microphone is used to colle