Time-domain reflection displays conceal spectral content and mislead comparison
Evidence
However, the height of a spike is affected by the frequency content of the reflection, and, without preor post-processing, time-domain displays are “blind” to spectrum. The measurement displays no information about the frequency content of the sound 185. it represents. Only if the spectra of the sounds represented by two spikes are identical can they legitimately be compared. — Toole, Floyd E, Sound reproduction- the acoustics and…, 672
Categorization
Category: Causal Relationships
- XREF: Directly relevant to room-correction DSP and acoustic measurement practice; ties to Chapter 7 ETC discussions.
Related
- Broadband ETCs are untrustworthy whenever reflections differ spectrally from direct sound (similarity 0.82)
- Frequency-domain differences track perceived distortion better than time-domain ones (similarity 0.82)
- Treating a measured reflection can remove it while leaving its audible effect intact (similarity 0.81)
- Removing conflicting reflections improves perception of low-level audio detail (similarity 0.79)
- Acoustical materials alter reflection spectra, invalidating broadband measurements for audibility (similarity 0.79)
- ETC displays can misreport reflection levels by about 20 dB versus audibility (similarity 0.78)
- Real-room reflections are attenuated and delayed, not equal-level and immediate. (similarity 0.78)
- ETC spike heights correlate inversely with actual audibility of reflections (similarity 0.78)
Broader Connections
- Audible effects of reflections require spectral comparison across time-domain spikes
#corroborates(0.85) — Toole, Floyd E, Sound reproduction- the acoustics and…, 677 - A time delay of a reflection imprints a comb of enhanced and suppressed frequencies
#expands(0.85) — Eric J. Heller, Why You Hear What You Hear- An…, 2550 - Reducing a reflection spike on a time-domain display can create no audible improvement
#corroborates(0.82) — Toole, Floyd E, Sound reproduction- the acoustics and…, 673 - Frequency-domain differences track perceived distortion better than time-domain ones
#corroborates(0.80) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 2390