narrow band filter

例句：

1. 1.The narrow-band filter was used to enhance the signal-to-noise ratio.
   窄带滤波器被用来提高信号与噪声的比率。
2. 2. The narrow-band filter is essential for maintaining a stable frequency response.
   窄带滤波器对于保持稳定的频率响应是必要的。
3. 3. The narrow-band filter effectively isolates the desired signal from the noise in the audio signal.
   窄带滤波器有效地从音频信号中的噪声中分离出所需的信号。