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REFLECTION PHASE GRATING [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2007-01-24

English

Subject field(s)
  • Building Insulation and Acoustical Design
  • Acoustics (Physics)
DEF

A diffuser of sound energy using the principle of the diffraction grating.

Key term(s)
  • reflection phase grating

French

Domaine(s)
  • Isolation et acoustique architecturale
  • Acoustique (Physique)
DEF

Diffuseur de l'énergie acoustique qui fait appel au principe du réseau de diffraction.

Spanish

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Record 2 2007-01-15

English

Subject field(s)
  • Acoustics (Physics)
  • Building Insulation and Acoustical Design
DEF

[A sound-diffusing] panel [that] scatters sound waves.

CONT

A Schroeder diffuser is a structure comprising a number of wells of different, carefully chosen depths.

CONT

[The] Schroeder diffuser ... is a high-performance quadratic residue diffuser that employs a series of 15 wells of specific depths to break up and scatter acoustic energy.

OBS

As a soundwave strikes the irregular surface, instead of bouncing off it like a mirror, it bounces out of each well at a slightly different time. The result is many small reflections, spread out in both time and space. The frequencies at which such structures operate as diffusers depend upon their dimensions.

French

Domaine(s)
  • Acoustique (Physique)
  • Isolation et acoustique architecturale
DEF

Panneau acoustique dispersant les ondes sonores qui est composé de nombreuses cellules de profondeur variable.

CONT

Le son émis par une enceinte ou un instrument se propage vers l'auditeur, le dépasse, va heurter une paroi sur laquelle il se réfléchit, avant de revenir directement ou non, vers l'auditeur. La somme son direct + réflexion crée des interférences qui dégradent la qualité du son. Le diffuseur de Schroeder disperse l'énergie dans le temps et l'espace. Les interférences disparaissent et le champ sonore s'élargit.

OBS

Lorsqu'une onde sonore frappe la surface irrégulière du panneau, cette dernière, au lieu de rebondir comme sur un miroir, réfléchit hors de chaque cellule dans des intervalles rapprochés. Il en résulte plusieurs petites réflexions sonores, dispersées dans l'espace et le temps.

Spanish

Save record 2

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