Product Design, Manufacturing & Innovation Resources
Hogar » Fenómeno de Gibbs

Fenómeno de Gibbs

1899
  • Henry Wilbraham
  • J. Willard Gibbs
Laboratorio de procesamiento de señales que analiza el comportamiento de las series de Fourier en discontinuidades.

(Imagen generada únicamente con fines ilustrativos)

The Gibbs phenomenon describes the behavior of a Fourier series at a jump discontinuity. The partial sums of the series exhibit an overshoot near the jump, which does not disappear as more terms are added. This overshoot converges to a constant value of about 9% of the jump height, regardless of the number of terms in the series.

When a function with a jump discontinuity, like a square wave, is approximated by its Fourier series, the approximation is not perfect at the discontinuity. As more terms are added to the series (i.e., as the approximation includes higher frequencies), the approximation gets better everywhere except in the immediate vicinity of the jump. Near the jump, the partial sum overshoots the function’s value. The width of this overshoot region shrinks as more terms are added, but the height of the overshoot remains constant.

This overshoot is not a sign of non-convergence. The series does converge pointwise, and at the discontinuity itself, it converges to the midpoint of the jump as predicted by Dirichlet’s theorem. However, the convergence is not uniform. The maximum overshoot, related to the Wilbraham-Gibbs constant, is approximately [latex]frac{1}{pi} int_0^pi frac{sin t}{t} dt – frac{1}{2} approx 0.08949…[/latex] times the jump size. This phenomenon is a fundamental property of series approximations of discontinuous functions and is important in signal and image processing, where it can manifest as ‘ringing’ artifacts near sharp edges.

UNESCO Nomenclature: 1201
- Álgebra

Tipo

Sistema abstracto

Ruptura

Sustancial

Uso

Uso generalizado

Precursores

  • Fourier series representation of discontinuous functions
  • Dirichlet’s convergence theorem
  • concept of partial sums and series convergence
  • study of the Sinc function [latex]\frac{\sin(x)}{x}[/latex]

Aplicaciones

  • signal processing (filter design)
  • image processing (artifact analysis)
  • numerical analysis
  • mri (magnetic resonance imaging)

Patentes:

NA

Ideas para posibles innovaciones

Debido al bloqueo del tráfico generado por bots, que actualmente supera los 40.000 al día, este contenido está reservado para los miembros de la comunidad.
> Iniciar sesión < o > Registrarse < (100% gratis) para acceder a esto, al igual que a todo el demás contenido y herramientas restringidos.

Related to: Gibbs phenomenon, Fourier series, jump discontinuity, overshoot, ringing artifact, signal processing, convergence, partial sums, Wilbraham-Gibbs constant, uniform convergence.

Contexto histórico

Fenómeno de Gibbs

1854
1854
1895
1899
1900
1911
1922
1850
1854
1884
1896
1900
1903
1914
1924

(Si la fecha es desconocida o no es relevante, por ejemplo "mecánica de fluidos", se proporciona una estimación redondeada de su aparición notable)

Invención, innovación y principios técnicos relacionados.

Las imágenes a tamaño completo y las descargas sólo están disponibles, 100% gratis, para los miembros registrados.

> Acceso <