band width correlator

例句：

1. 1. The band-width correlator is used to measure the frequency response of a system.
   带通相关器用于测量系统的频率响应。
2. 2. In signal processing, the band-width correlator is used to filter out noise and extract useful signals.
   在信号处理中，带通相关器被用来滤除噪声并提取有用的信号。
3. 3. The band-width correlator was developed to improve the accuracy of frequency measurements in radar systems.
   带通相关器的开发是为了提高雷达系统中频率测量的准确性。