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相关概念视频

Properties of Fourier Transform II01:24

Properties of Fourier Transform II

320
The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
The Frequency Shifting property of Fourier Transforms highlights that a shift in the frequency domain corresponds to a phase shift in the time domain. Mathematically, if x(t) has...
320
Properties of Fourier Transform I01:21

Properties of Fourier Transform I

246
The application of Fourier Transform properties in radio broadcasting is multifaceted, enabling significant advancements in the way signals are transmitted and received. Key areas where these properties are utilized include simultaneous multi-channel transmission, audio clip speed adjustments, live broadcast delays for different time zones, audio frequency adjustments, and signal demodulation.
In radio broadcasting, multiple audio signals often need to be transmitted simultaneously. The Fourier...
246
Continuous -time Fourier Transform01:11

Continuous -time Fourier Transform

412
The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...
412
Sampling Theorem01:15

Sampling Theorem

771
In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
771
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

149
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
149
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

4.0K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
4.0K

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相关实验视频

Updated: Sep 14, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

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通过光纤进行时频传输.

Ziyang Chen1, Yufei Zhang1, Bin Luo2

  • 1State Key Laboratory of Photonics and Communications, School of Electronics, and Center for Quantum Information Technology, Peking University, Beijing 100871, China.

National science review
|July 25, 2025
PubMed
概括
此摘要是机器生成的。

光学双向时频传输使用光纤在网络中连接时钟. 本综述详细介绍了全球高精度计时的进展,挑战和未来应用.

关键词:
高精度的高精度的高精度.长距离的长途旅行有光纤的光学纤维.时间频率转移时间.

更多相关视频

Quasi-light Storage for Optical Data Packets
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Quasi-light Storage for Optical Data Packets

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Microfluidic Imaging Flow Cytometry by Asymmetric-detection Time-stretch Optical Microscopy ATOM
07:19

Microfluidic Imaging Flow Cytometry by Asymmetric-detection Time-stretch Optical Microscopy ATOM

Published on: June 28, 2017

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相关实验视频

Last Updated: Sep 14, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

10.0K
Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

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Microfluidic Imaging Flow Cytometry by Asymmetric-detection Time-stretch Optical Microscopy ATOM
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Microfluidic Imaging Flow Cytometry by Asymmetric-detection Time-stretch Optical Microscopy ATOM

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科学领域:

  • 计量学 计量学 计量学
  • 光学物理学 光学物理学
  • 网络工程 网络工程

背景情况:

  • 光学时频传输对于同步大型时钟网络至关重要.
  • 基于光纤的传输利用现有基础设施进行高效的同步.
  • 精确的时频传输是各种科学和技术应用的基础.

研究的目的:

  • 提供对光学双向时频传输的全面审查.
  • 讨论系统配置,关键模块和传输方法.
  • 突出该领域的挑战和未来前景.

主要方法:

  • 时间频传输稳定性的表征.
  • 分析系统配置和关键技术模块.
  • 审查主流光学双向时频传输技术.

主要成果:

  • 在描述转移稳定性的进展已经详细说明.
  • 讨论了系统实施中的关键组件和挑战.
  • 介绍和分析了各种主流转移方法.

结论:

  • 光学双向时频传输已经显著进步.
  • 全球范围的高精度时钟网络需要进一步发展.
  • 未来的应用程序有望提高时间同步.