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近年发展起来的数字采集(或数字存储)技术,为瞬态信号测试提供了极为优越的条件。然而采样频率的选取既影响到丢失信号信息的大小,又影响到是否能将信号完整地采集下来。文中给出两种确定信号带限频率的简便方法和合理选择采样频率的基本原则,并通过对兵工研究中常见的一些瞬态信号波形测试实例,介绍这些方法的应用。
In recent years, digital acquisition (or digital storage) technology developed for the transient signal test provides a very superior condition. However, the selection of sampling frequency not only affects the size of lost signal information, but also affects whether the signal can be collected completely. In this paper, two simple methods to determine the band-limited frequency of the signal and the basic principles of choosing the sampling frequency rationally are given. The application of these methods is introduced through some examples of waveform tests commonly found in military research.