band-pass transformer

例句：

1. 1.The band-pass transformer is used to filter out frequencies above and below the desired range.
   带通变换器用于过滤掉所需频率范围以外的频率。
2. 2. In digital signal processing, the band-pass transformer is used to enhance the signal's frequency response.
   在数字信号处理中，带通变换器用于增强信号的频率响应。
3. 3.The band-pass transformer was designed to improve the signal-to-noise ratio in the audio signal.
   带通变换器被设计用来提高音频信号中的信噪比。