The importance of the first 80 ms of room impulse responses: A historical review
Bibliographic record
Abstract
The direct sound and reflections arriving within 80 ms after it are particularly important to the perceived quality of sound in rooms such as concert halls and auditoria and have been the focus of the majority of research on concert hall acoustics over the past 50 years. Most of the sound energy is usually concentrated in this time interval and this early sound energy determines many of the perceived characteristics of the hall. Although some remarkable early experiments date back to the 1850s, the major advances concerning how these early reflections are perceived have occurred more recently. Monaural effects including explanations of how our hearing system integrates early reflections, the precedence effect, and the development of measures of clarity and intelligibility have developed from initial work in the 1950s. A little more recently the binaural effects leading to perceived spatial impression have been explained and shown to be critical to achieving good concert halls. Physical measures have been developed that relate to both the monaural and binaural subjective phenomena. This work will review the development of our understanding of the importance of early arriving sound on the acoustical characteristics of concert halls and auditoria.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.003 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.002 | 0.003 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".