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首页> 外文会议>Engineering in Medicine and Biology Society, 1998. Proceedings of the 20th Annual International Conference of the IEEE >Parallel implementation of a Choi-Williams TFD for Doppler signal analysis
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Parallel implementation of a Choi-Williams TFD for Doppler signal analysis

机译：Choi-Williams TFD用于多普勒信号分析的并行实现

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摘要

The spectral width and mean frequency of Doppler signals is used to measure and characterise lesion-induced flow disturbance. Conventional methods of spectral estimation based on the Fourier transform compromise the measurement accuracy since these methods implicitly assume signal stationarity during the signal window under analysis. New methods based on Time-Frequency Distribution (TFD), especially developed for non-stationary signal analysis, are now being introduced which avoid these limitations, at the cost of an increase in the computation burden required. This paper describes the parallel implementation of one TFD method, the Choi-Williams Distribution (CWD), in a transputer platform with 5 processors. The goal is to obtain a real time spectral analyser.
机译：多普勒信号的频谱宽度和平均频率用于测量和表征病变引起的血流干扰。基于傅立叶变换的常规频谱估计方法会损害测量精度，因为这些方法在分析的信号窗口期间隐式地假定了信号平稳性。现在正在引入基于时频分布（TFD）的新方法，特别是针对非平稳信号分析而开发的方法，这些方法避免了这些限制，但以增加所需的计算负担为代价。本文介绍了在具有5个处理器的晶片机平台中并行执行一种TFD方法Choi-Williams Distribution（CWD）。目的是获得实时频谱分析仪。

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