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SA102RAUL15

SA102RAUL15

发布时间:2019-01-11 15:48:29点击率:

所属行业:五金原材料-> 废金属-> 废镍
价格:¥1200
规格:SA102RAUL15
供货总量:1

SA102RAUL15

SA102RAUL15

SA102RAUL15

SA102RAUL15

SA102RAUL15

IDT90E36A内置的离散傅立叶分析(DFT)计算引擎可完成6

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个通道2-32次的谐波分析功能。

 2是一种典型的信号识别系统框图。

2

对数字信号进行快速傅里叶变换,可得到数字信号的分析频谱。分析频谱是实际频谱的近似。傅里叶变换是对延拓后的周期离散信号进行频谱分析。如果采样不合适,某一频率的信号能量会扩散到相邻频率点上,出现频谱泄漏。

所谓频谱泄露,就是信号频谱中各谱线之间相互干扰,使测量的结果偏离实际值,同时在真实谱线的两侧的其它频率点上出现一些幅值较小的假谱。产生频谱泄露的主要原因是采样频率和原始信号频率不同步,造成周期的采样信号的相位在始端和终端不连续。简单来说就是因为CPU FFT 运算能力有限,只能处理有限点数的 FFT,所以在截取时域的周期信号时,没有能够截取整数倍的周期。信号分析时不可能取无限大的样本。只要有截断不同步就会有泄露。

为了减少频谱泄漏,通常在采样后对信号进行加窗处理。常见的窗函数有矩形窗(即不加窗)、三角窗、汉宁窗、汉明窗、高斯窗等。除了矩形窗外,其他的窗在时域上体现为中间高、两端低特征。

傅里叶分析的频率分辨率主要是受窗函数的主瓣宽度影响,而泄漏的程度则依赖于主瓣和旁瓣的相对幅值大小。矩形窗有小的主瓣宽度,但是在这些常见的窗中,矩形窗的旁瓣大。因此,矩形窗的频率分辨率,而频谱泄漏则大。不同的窗函数就是在频率分辨率和频谱泄漏中作一个折中的选择。

IDT90E36A中采用汉宁窗(Hanning)进行计算,需使能汉宁窗口。汉宁窗口的作用是在DFT 计算时将A/D 采样的信号变为周期性,以达到准确的计算结果。汉宁窗可以看成是升余弦窗的一个特例,汉宁窗可以看作是3个矩形时间窗的频谱之和,或者说是3sinct)型函数之和。


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