Extended high frequencies for fricative classification in conversational speech
Bibliographic record
Abstract
The current study examines whether the information contained in Extended High Frequencies (EHFs) can improve random forest classification accuracy for fricatives in conversational speech. Prior phonetic research has investigated fricative categorization based on their acoustic characteristics, including spectral, temporal and amplitudinal measures. The spectral measures in these studies have largely been limited to frequency information below 8 kHZ. Only a few studies have examined the contribution of EHFs, energy exceeding 8 kHz. These studies have primarily focused on laboratory speech, so little is currently known about the role of EHFs in more spontaneous, conversational speech styles. Using a corpus of sociolinguistic interview speech from Western Canadian English sampled at 44.1kHz, we compare classification models with and without frequencies above 8 kHz. We discuss the influence of EHFs on the categorization of fricative identity, and share a cost-benefit analysis of sampling at higher frequencies for speech research corpora.
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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 | 0.007 | 0.015 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.002 |
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".