Measurement of 3-D directional characteristics of reverberant sound fields using a spherical microphone array
Bibliographic record
Abstract
A new measurement system has been used to analyze directional characteristics of reverberant sound fields in several small- and medium-sized rooms. The system employs a pair of 32-element spherical microphone arrays to obtain the room impulse response in each of 60 steering directions. The two different-sized arrays are used to cover the frequency range from 300–3300 Hz with an angular (directional) resolution of about 28 degrees. An analysis of these directional room impulse responses enables the variation of arriving sound energy with (3-D) direction and time to be studied. Specifically, the isotropy of the sound field at the receiving position can be assessed at any time instant, or over any time range desired. Directions from which significant or insignificant proportions of sound energy arrive are identifiable. Furthermore, the time and direction of incidence of the direct sound and discrete early reflections can be identified. This can be of use in localizing sources, finding reflections, and in decomposing the sound field into arriving components.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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".