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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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 finite,...
The Y-to-Y Circuit01:19

The Y-to-Y Circuit

In a balanced four-wire wye-to-wye system, the arrangement involves wye-connected sinusoidal voltage sources and loads, connected through a neutral wire that links the neutral nodes of the source and load. The load impedance is connected across each phase of the load. The wye-connected source can be connected to the wye-connected load in four-wire and three-wire arrangements. A three-phase system is considered balanced when the load on each phase is equal, leading to uniform current flow and...
Phasor Arithmetics01:13

Phasor Arithmetics

Phasors and their corresponding sinusoids are interrelated, offering unique insights into the behavior of alternating current (AC) circuits. One way to understand this relationship is through the operations of differentiation and integration in both the time and phasor domains.
When the derivative of a sinusoid is taken in the time domain, it transforms into its corresponding phasor multiplied by j-omega (jω) in the phasor domain, where j is the imaginary unit, and ω is the angular frequency.
Series Impedances: Three-Phase Line01:27

Series Impedances: Three-Phase Line

Calculating series impedances for a three-phase overhead line involves evaluating resistances and inductive reactances in a network with three-phase and multiple neutral conductors grounded at regular intervals.
Using Kirchhoff's laws, an integro-differential equation for the network is derived. This equation accounts for unbalanced phase currents, which may induce return currents through neutral wires and the earth, seeking the least impedance path. Earth return conductors can replace the...

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Related Experiment Video

Updated: Jun 20, 2026

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Binary multiplexing and the phase-retrieval problem.

D C Ghiglia

    Optics Letters
    |August 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel binary-mask multiplexing method enables unambiguous phase recovery from modulus measurements. This technique, based on Fourier-transform theory, works for both optical-digital and digital simulations.

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    Published on: January 28, 2019

    Area of Science:

    • Optics and Photonics
    • Digital Signal Processing
    • Computational Imaging

    Background:

    • Phase information is crucial in wave-based imaging but difficult to recover directly.
    • Existing methods for phase retrieval often suffer from ambiguities or require specific experimental setups.

    Purpose of the Study:

    • To develop a robust method for unambiguous phase recovery.
    • To enable phase information retrieval from intensity-only measurements using binary masks.

    Main Methods:

    • Development of a binary-mask multiplexing technique.
    • Application of Fourier-transform theory and combinatorial analysis.
    • Derivation for both continuous (optical-digital-hybrid) and discrete (digital simulation) cases.

    Main Results:

    • Unambiguous recovery of phase information demonstrated through computer simulations.
    • The developed matrix equations show good conditioning for practical applications.

    Conclusions:

    • The binary-mask multiplexing method offers a reliable approach for phase retrieval.
    • The technique is versatile, applicable to both hybrid optical-digital systems and purely digital simulations.