Well, if you multiply this signal by a sine wave of an arbitrary frequency, the two waves are uncorrelated.

好吧， 如果将此信号乘以任意频率的正弦波，则两个波是不相关的。

You can calculate these sine and cosine amplitudes separately or you can use Euler's formula so you only need to multiply your signal by one exponential term.

您可以分别计算这些正弦和余弦幅度，也可以使用欧拉公式，这样您只需将信号乘以一项指数项即可。

If you wanna know how much of a particular sine wave is in a signal, just multiply the signal by the sine wave at each point and then add up the area under the curve.

如果您想知道信号中有多少特定正弦波，只需将信号乘以每个点的正弦波， 然后将曲线下的面积相加即可。