amplitude-frequency character

• 幅频特征

amplitude-frequency character的用法和样例：

例句

1. Secondly, to the nonstationarity of diesel engine noise, this paper focuses on the extraction of time frequency feature using wavelet scalogram.
   其次针对噪声信号的非平稳性，研究基于小波尺度谱噪声分量的时频特征分析。