Joint time Frequency Analysis (JTFA) describes and determines how the frequencies of non stationary signals change over time. It offers a better understanding of nature of the signal.
时-频联合信号分析法能描述非稳态信号的频率如何随时间而变化，故它能使我们更好地理解信号的本质。
MethodsThe frequency, time of occurrence, the nature of the fluid and the relationship with prognosis in 25 clinical diagnostic cases were analyzed.
方法分析经临床诊断的25例急性重症胰腺炎并发的浆膜腔积液的发生率、发生时间、积液性质及其与预后的关系。
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