Improving spectral parameters estimation for non stationary biological signals by means of a real time adaptive system

R. Sacco, C. Di Giuliomaria, C. Capponi, T. D'Alessio, E. Zanette
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Abstract

A novel spectrum analyzer is presented which implements a real-time fast Fourier transform up to a frequency of 40 kHz and uses the adaptive algorithm to estimate maximum frequency with a high immunity from noise. Starting with this adaptive filtering, the other spectral parameter can be easily estimated. The system has been evaluated both with simulated and real signals, showing performances uniformly better than those of commercially available systems. Some applications to Doppler and myoelectric signals are reported and discussed. Preliminary results show that this system can be profitably used when nonstationary signals are to be studied.<>
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利用实时自适应系统改进非平稳生物信号的谱参数估计
提出了一种新的频谱分析仪,实现了40 kHz频率的实时快速傅立叶变换,并采用自适应算法估计最大频率,具有较高的抗噪性。从这种自适应滤波开始,其他光谱参数可以很容易地估计出来。该系统已通过仿真和实际信号进行了评估,其性能均优于市售系统。报道并讨论了多普勒和肌电信号的一些应用。初步结果表明,该系统可以很好地应用于非平稳信号的研究。
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