spot noise figure

例句：

1. 1. The noise figure of the microphone is very high, which affects its performance.
   麦克风的噪声系数非常高，这影响了其性能。
2. 2.In order to improve the signal-to-noise ratio, we need to reduce the noise figure.
   为了提高信号与噪声比，我们需要降低噪声系数。
3. 3.The noise figure of the communication system is an important factor in determining its performance.
   通信系统的噪声系数是决定其性能的一个重要因素。