V2EX power spectrum

Power Spectrum

释义 Definition

功率谱 / 功率频谱:在信号处理、物理与统计中,描述一个信号(或随机过程)的“功率”如何随频率(或空间尺度/波数)分布的图或函数。常用于分析周期成分、噪声特性与系统响应。(在不同领域也会见到“能量谱”等近义表述。)

发音 Pronunciation (IPA)

/par spktrm/

词源 Etymology

power 源自拉丁语 potere(“能够”)经古法语演变而来,在工程语境里指“功率/能量输出率”。spectrum 源自拉丁语 spectrum(“影像、显现”),在科学中指“分布范围”。合起来,power spectrum 字面即“功率的分布图”,引申为“频率/尺度上的功率分布”。

例句 Examples

The power spectrum shows a strong peak at 60 Hz.
功率谱在 60 赫兹处显示出一个明显的峰值。

By estimating the power spectrum of the recorded signal, the researchers identified both the dominant oscillations and the broadband noise.
通过估计记录信号的功率谱,研究人员同时识别出了主要振荡成分和宽带噪声。

相关词 Related Words

文学与典籍 Literary Works

  • Numerical Recipes: The Art of Scientific Computing(数值计算经典教材中讨论功率谱估计与谱分析方法)
  • The Feynman Lectures on Physics(《费曼物理学讲义》相关章节涉及频谱与随机过程的思想背景)
  • Spectral Analysis and Its Applications(谱分析专著,系统使用“power spectrum”等术语)
  • The Large-Scale Structure of the Universe(P. J. E. Peebles;宇宙学中常讨论物质/密度扰动的功率谱)
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