noise spectra

例句：

1. 1.The noise spectra of the sound waves are analyzed to determine their frequency distribution.
   通过对声波的噪声谱进行分析，可以确定其频率分布。
2. 2.The noise spectra were measured using a high-resolution microphone.
   使用高分辨率麦克风测量了噪声谱。
3. 3. The noise spectra were used to improve the quality of the audio signal.
   噪声谱被用来提高音频信号的质量。