摘要
利用LabVIEW图形化开发软件,提出了一种音频信号检测系统设计方案。首先利用麦克风采集被测对象产生的音频信号,再通过计算机的声卡转换为数字信号,最后由自制音频检测虚拟仪器实现音频信号的时域分析、频域分析及数据存储等功能。该系统对木琴的金属音条进行了测试,由木槌击打音条来产生脉冲激振,响应信号被系统采集分析,进而得出每根金属音条的固有频率、内耗两项参数。
An acoustic detecting system was developed based on the LabVIEW graphical programming environment.The audio signal produced by the tested body is firstly acquired by microphone,and then transduced into digital signal through soundcard.At last,the self-developed Virtual Instrument performs the audio signal＇s time-domain analysis,frequency-domain analysis,and data-saving,etc.The system has been used to test xylophone＇s metal bars,which are striked by a mallet as an impulse excitation,and according to their responses,the value of every bar＇s natural frequency and internal friction are acquired.
出处
《仪器仪表用户》
2011年第3期78-80,共3页
Instrumentation
关键词
音频检测
LABVIEW
声卡
固有频率
内耗
acoustic detecting
LabVIEW
soundcard
natural frequency
internal friction
