The effect of ancillary volume on sound transmission measurements using ASTM standard test method E336
Bibliographic record
Abstract
The effects of ancillary volume on sound transmission measurements by ASTM Standar E336-05 to access airborne sound isolation, are described. The ancillary volume is required to be disregarded if the average sound pressure level in the ancillary volume is more than 6. Different field scenarios are simulated using the four-room Flanking Transmission Facility at the NCR/IRC. The effect is considerably less when the ancillary volume is highly absorptive relative to the receive room principal volumes. The difference in the ALT with and without an ancillary volume is a function of two parameters. The first one is space-average level between the principal and ancillary volumes, and the second is sound field measurements associated with the ancillary volume. Estimates of the ALT is obtained using sound field measurements restricted to the principal volume when the difference in space average level between the principal and ancillary volume is more than 4 dB.
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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 | 0.010 | 0.044 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".