sina signal的用法和样例：
例句
- This is equivalent to requiring that the Nyquist frequency be strictly greater than the bandwidth or the signal.
一个频率正好是采样频率一半的正弦信号，通常会混叠成另一相同频率的正弦信号，但它的相位和幅度改变了。 - This paper introduces a single chip computer control system which is used for regulating amplitudes of sine radio frequency signal with discontinuous waveforms.
介绍了一个用于调整非连续状态射频正弦信号幅值的单片机控制系统。
