sum frequency

• 总频率,和频

sum frequency的用法和样例：

例句

1. It realizes graphics protraction of time and frequency domain in every time period.
   它实现了各个信号的时域和频域的图形的绘制。
2. The simulation for QPSK shows that the algorithm can estimate the carrier phase and frequency offset accurately and reduce the system BER effectively.
   结果表明，用该算法可以精确估计载波相位和频差，有效地降低系统的误码率。