Methods Static isometric loading of the biceps and low back muscle was performed in 14 subjects, using FFT power spectrum and its two dimensional mapping to analyze SEMG signals from these muscles.
方法14名受试者分别参加肱二头肌和腰部脊竖肌等长运动负荷实验，取表面肌电信号进行FF T功率谱及其功率谱二维地形图分析。
The correlation method and FFT method of the power spectrum estimation could not completely reflect the concept of the power spectrum of the non-stationary random signals because of data truncation.
对于非平稳随机信号的功率谱分析，采用自相关函数傅里叶变换和直接傅里叶变换分析时，由于存在数据截断，二者从概念上都不能很好地反映随机信号的功率谱。
Traditional speech signal processing is based on FFT power spectral analysis, in noisy condition, the spectrum of noise and speech signal are processed in the same way.
传统语音信号谱特征的提取是基于FFT 的能谱分析方法，在噪音环境情况下，对噪音的频谱成分与语音信号的频谱成分的处理采用“平均主义”的原则。
After the chatter frequency is idenrified through the power spectrum of the chatter signals dy carrying out FFT, the best phase difference and the related tooth cutting period are calculated.
然后根据颤振系统与切削周期的能量关系，计算出最优相位差及相应的切削周期；
After the chatter frequency is idenrified through the power spectrum of the chatter signals dy carrying out FFT, the best phase difference and the related tooth cutting period are calculated.
然后根据颤振系统与切削周期的能量关系，计算出最优相位差及相应的切削周期；
应用推荐