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Frequency Weight Power Spectrum Analysis Method Based on Hanning Window Interpolation FFT
Author(s): LING Zuo
Pages: 72-
76
Year: 2014
Issue:
9
Journal: China Instrumentation
Keyword: Hanning窗; 频率计权; 频谱分析; MSP430;
Abstract: 频率计权的频谱分析是噪声测量仪器的重要测量指标.本文使用FFT方法实现频率计权,针对信号截断引起的频谱泄露和栅栏效应,采用几种典型窗函数对宽带声音信号的A、C频率计权频谱进行了分析比较,得出不同窗函数下的频谱特性,由此提出一种基于Hanning窗插值FFT的A、C频率计权频谱分析方法.以MSP430系列CPU芯片为数据处理核心的数字声级计平台上得到验证实现,仿真结果表明该方法可有效降低频谱泄露和栅栏效应对频谱分析结果的影响,与已有频率计权实现方法相比精度有明显提高.
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