Room resonances occur at frequencies where whole numbers of wavelengths fit between surfaces
Evidence
This equation shows that there is an infinite number of possible modal frequencies at which an integer number of wavelengths fit into the room, with lowest modal frequency occurring when just one half wavelength fits into the space between the reflecting surfaces. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1959
Categorization
- DEFINE: Lays out the basic standing-wave condition that defines room modes.
Related
- Standing waves form when wavelengths match room dimensions (similarity 0.90)
- Axial mode frequencies are computable from room dimensions by a simple formula (similarity 0.83)
- Room standing waves cause sound pressure to vary with listening position (similarity 0.82)
- Axial room modes can be predicted from room dimensions alone (similarity 0.82)
- Cyclic sound paths create standing waves when path lengths match half wavelengths (similarity 0.82)
- Room acoustics shift from standing waves to irregular interference as frequency rises (similarity 0.82)
- Oblique room modes depend on all three dimensions (similarity 0.81)
- Standing waves create loudness dips at room midpoints (similarity 0.81)
- Spatially proportional room dimensions create coincident resonant modes (similarity 0.81)
- Every room has a low-frequency limit below which modal effects dominate (similarity 0.81)
- Standing waves are a subclass of the more general phenomenon called resonant modes (similarity 0.81)
- Hard-walled rooms behave as three-dimensional resonators with many audible modal frequencies (similarity 0.81)
- Room resonances above 200 Hz overlap heavily, forcing isolated modes below that threshold (similarity 0.81)
- Room resonances shift from isolated to overlapping at the Schroeder frequency (similarity 0.81)
- Room modes are determined by the linear dimensions of opposing surfaces (similarity 0.80)