利用超声频谱分析法成功地实现了缺陷的分类，试验结果表明，超声频谱分析技术可提高检测结果的可靠性。
Flaw classification is realized successfully through the ultrasonic spectrum analysis. The research proves that ultrasonic spectrum technology will promote the reliability of testing results.
再对滤波后所得的脉冲信号进行频谱分析，容易提取所需的缺陷信息。
And then the spectrum analysis on the pulse signals is made after filtering, the defect information is easily to be extracted.
第三，我国无线电频谱资源用益物权制度的现状及缺陷。
Third, the status and defects of system of usufruct of radio spectrum resources.
应用推荐