Waves transitioning from bounded to unbounded space create interfering reflections
Evidence
In the context of loudspeaker design it is the bounded to unbounded case that is important as this is what happens when a sound wave from a loudspeaker reaches the edge of the front face of an enclosure. In this situation, the wave is making a transition from being bounded by the front of the enclosure to being unbounded, as shown in Figure 6.63. The con sequential reflections cause disturbances to the frequency response of the loudspeaker because they interfere with the main output. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2199
Categorization
Category: Causal Relationships
Related
- Sound waves diffracting at speaker cabinet edges distort the frequency response (similarity 0.91)
- Edge diffraction sources can be canceled by out-of-phase speakers (similarity 0.89)
- Sound diffracts strongly only when wavelengths exceed opening size (similarity 0.88)
- A single boundary reflecting sound off an omnidirectional source creates frequency-dependent interference lobes (similarity 0.85)
- Bounded sound waves change impedance with tube area, causing reflections (similarity 0.85)
- Reflected sound waves interfere with direct waves to create frequency peaks and dips (similarity 0.84)
- Reflections from adjacent walls create destructive interference nulls at one-half wavelength spacing. (similarity 0.84)
- Early lateral reflections are attenuated by loudspeaker directivity, not harmful. (similarity 0.84)
- A single sound source near a reflecting surface creates interference via an image source (similarity 0.83)
- Acoustic waves reflect at discontinuities in tract area (similarity 0.82)
- Redirecting reflections creates uneven hot spots while absorption shortens reverberation (similarity 0.82)
- Room boundaries alter loudspeaker output through reflected image sources (similarity 0.82)
- Sitting close to a rear wall creates early strong reflections that corrupt perceived sound (similarity 0.82)
- A flat-response speaker still shows boundary-induced frequency changes in room (similarity 0.82)
- Greater loudspeaker-wall separation shifts the adjacent-boundary dip to lower frequencies (similarity 0.82)
Broader Connections
- Redirecting reflections creates uneven hot spots while absorption shortens reverberation
#expands(0.85) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2291 - Correlated waves interfere with each other while uncorrelated sources do not
#qualifies(0.80) — David Howard, Jamie Angus, coustics and Psychoacoustics, 356