如果 data_array 中不包含任何数值，函数 FREQUENCY 将返回一个零数组。

频率调制（Frequency Modulation, FM）是一种重要的调制技术，广泛应用于无线广播和通信，本文对 GNU Radio 中的 Frequency Mod 模块进行深入剖析。

A particularly useful solution of the wave equation is a wave with a particular wavelength λ. This is known as the harmonic wave solution and corresponds to the...

现在的时态比较富，家家户户基本上都有宽带。有了宽带，必须有“路由器”！路由器？：是连接两个或多个网络的硬件设备，

用一句通俗易懂的话就是：等待元素已被加载完全之后，再去定位该元素，就不会出现定位失败的报错了。

From human speech perception to considerations for features for automatic speech recognition

The waveform and a definition of the fundamental period.

Sound is a wave of pressure travelling through a medium, such as air. We can plot the variation in pressure (captured by microphone) against time to visualise t...

In the frequency domain, periodic signals have harmonic structure: they contain energy only at multiples of their fundamental frequency.

《自然-通讯》发表的一篇论文Changes in Atlantic major hurricane frequency since the late-19th century发现，大西洋最强飓风（强飓风）近期的增加，可能不属于百年尺度上的变化，而是从20世纪60至80年代最低活动水平的回升...