摘要阐述了虚拟仪器技术的概念和特点，精确测量了３ 种乐音信号的波形。The conceptions and properties of virtual instrument are described.Three sound signals are measured,and the results of frequency analysis are given directly.
9[3]J ozsef G Nemeth, Balazs Vargha, Istvan Kollar. Online frequency Domain System Identification Based on a Virtual Instrument [ J ]. Instrumentation and measurement, 2000,49 (6) : 1260 ～ 1263.
10[4]Alfonso Carkisena, Carlos Macua. Miroslav zivanovic Instrument for the Measurement of the Instantaneous Frequency[ J ] . Instrumentation and Measurement, 2000,49 (4): 783 ～ 789.
