two-frequency selection

例句：

1. 1. In the digital signal processing field, two-frequency selection is widely used for noise reduction and signal enhancement.
   在数字信号处理领域，双频选择被广泛用于噪声减少和信号增强。
2. 2. The two-frequency selection method can effectively reduce the interference of multipath fading channels.
   双频选择方法能有效地减少多径衰落信道的干扰。
3. 3. The two-frequency selection algorithm has been applied to many fields such as wireless communication and radar detection.
   双频选择算法已被应用于无线通信和雷达探测等多个领域。