Description: sound card number or frequency of PC sound card can not only output and recording audio signals, use its internal A/D (analog/digital) converter, through the preparation process could also be used to the cyclical external analog signal is sampled, and the calculated value of the frequency signal. Wen described the author of the design process is one of the procedures, to meet the general electronic enthusiasts use the PC as a digital frequency meter use requirements. The procedure is the standard Windows interface, the interface is friendly to the black background of red font tuba frequency, with catchy and simple procedures and high measurement accuracy characteristics,
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