Weak interfering waves under one eighth intensity produce negligible comb filtering
Evidence
If the two waves are not of equal amplitude, then the interference effect is reduced, also as shown in Figure 1.27. In fact, once the interfering wave is less than one eighth of the other wave, then the peak variation in sound pressure level is less than 1 dB. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 365
Categorization
Category: Factual Claims
- ADDENDUM: Supports the claim in the trees-as-infrastructure piece that physical interference effects can be engineered away with amplitude ratios.
- SHARE: Nerdy but useful for anyone mixing audio, e.g. a musician friend dealing with phasing issues from reflections.
Related
- Interference becomes negligible when the interfering wave drops below an eighth of the other (similarity 0.90)
- Unequal wave amplitudes quickly reduce interference effects below 1 dB peak variation (similarity 0.89)
Broader Connections
- Interference becomes negligible when the interfering wave drops below an eighth of the other
#corroborates(0.95) — David Howard, Jamie Angus, coustics and Psychoacoustics, 360 - Correlated waves interfere with each other while uncorrelated sources do not
#expands(0.72) — David Howard, Jamie Angus, coustics and Psychoacoustics, 356