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。
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。
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。
Some sine waves are harmonic whose frequency does not equal to the frequency of fundamental component.
有些正弦波谐波，其频率不等于频率的基本组成部分。
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。
When we think about how to represent sound visually, most of us probably picture those volume-dependent sine waves.
说到如何用图像表示声音，大多数人都会想起与音量有关的正弦曲线。
Phase Angle Phase Angle refers to the relation between two sine waves which do not pass through zero at the same time.
相角相角指的是两个不同时经过零点的正弦波之间的关系。
Every month for the past 18 years, he has tuned in to the signal coming from 55 Cancri A. Gradually, the separate sine waves have become visible.
在过去十八年的每个月中，马西博士都会接受恒星“55Cancri A”发出的讯号。逐渐地，“正弦波”曲线出现明显的分离。
By two groups imitation experiments, the correctness and practicability of this method is proved, so the precise evaluation of parameters of sine waves is realized.
以两组仿真实验结果，验证了本文所述方法及过程的正确性和实用性，从而实现了正弦波形参数的精确评价。
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。
A distorted sine signal is simulated in the system, and the on-line harmonic monitoring is carried out through this system, revealing the state of its basic wave and harmonic waves.
该系统模拟生成一畸变正弦信号，并运用该系统实现谐波的在线监测分析，得出其基波与谐波的情况。
The transmitted signals which were modulated is a group of orthogonal sine signals as subcarrier and non-regular zero square waves that the code elements period is t as baseband coded formats.
它所发送的信号是由一组正交的正弦信号作为副载波，用码元周期为T的不归零方波作为基带码型调制而成的。
A distorted sine signal is simulated in this paper, and the harmonic analysis is carried out through the above measure, revealing the state of its basic wave and harmonic waves.
该系统模拟生成一畸变正弦信号，并运用该系统实现谐波的在线监测分析，得出其基波与谐波的情况。
The generator can output three kinds of waves : sine wave , square wave , triangle wave.
该函数信号发生器可输出三角波，方波和正弦波。
Power Factor Correction (PFC) technique make input current waves sine, improve efficiency of the system and reduce harmonic waves.
功率因数校正技术对输入电流进行校正，提高设备利用率，减少谐波对电网的污染。
Power Factor Correction (PFC) technique make input current waves sine, improve efficiency of the system and reduce harmonic waves.
功率因数校正技术对输入电流进行校正，提高设备利用率，减少谐波对电网的污染。
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