文中的分析与结论对频谱分析系统的正确使用具有指导意义和实用价值。
The analytical and experimental results are very useful for the rational use of Fourier spectrum analysis system.
第四章介绍了在自行构建的超声频谱分析系统上，进行超声频域特征应用方法与技术的研究。
Chapter 4 introduces the research of application and techniques of ultrasonic spectrum features on the analytic system which has been constructed.
通过实验测试，频谱分析系统使用简便直观，只要接到信号源与示波器之间，即可观察信号的频谱。
The using of spectrum analyses system is easy and visual, after testing in lab. Only interfacing it between the signal and oscilloscope, then you can observe spectrum of signal.
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