Fourier analysis is the mathematical method used to break sounds down into sine waves.
傅里叶分析是将声音分解为正弦波的数学方法。
Square waves, like sine waves, are periodic.
方波如正弦波一样是周期性的。
Next, imagine the combination of several sine waves.
接著，想像有数个正弦波的组合。
In general, sounds are represented by a sum of sine waves.
一般的，声音表现为多个正弦波的叠加。
They thus have sine waves with large amplitudes and short wavelengths, both of which make them easy to see.
这样，这些大行星就具有大振幅与短的波长“正弦波”曲线，而这两种特性让它们能更容易地被观察到。
The paper takes advantage of a single close-loop control method based on voltage feedback, and enables the inverter to produce steady sine waves by the digital PID adjuster designed.
本文采用电压反馈的闭环控制方式，设计完成了数字PID调节器，使逆变器输出稳定的正弦波。
According to the principles of numeration table, the author puts forward simple but practical methods of how to measure the mean values, virtual values and peak values of non sine waves.
根据数字万用表的测试原理，提出了用其测量非正弦波电压平均值、有效值及峰值的简单实用的方法。
When the frequencies of the sine waves increase, the frequency dispersion of the hysteresis loops of the rocks is strengthened. This effect is also intensified with the saturation fluids.
随着正弦波频率增加岩石的滞回圈频散效应增强，饱和液体加强了这种频散作用。
Realistic signals are made by summing sine waves of lots of frequencies, so that after some finite number of wavelengths they interfere destructively and you get a signal of finite width and duration.
现实中的信号由各种频率的正弦波组成，因此，在有限的波长数后，它们会干涉相消，你就得到一个有限宽度和有限延续的信号。
Sine waves, or sinusoids, are graphs of mathematical functions.
正弦波，或正弦曲线，是数学函数的图形。
Sine waves, or sinusoids, are graphs of mathematical functions.
正弦波，或正弦曲线，是数学函数的图形。
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