Abstract
This paper exploits band-limited cepstral coefficients (BLCCs) in forensic voice comparison (FVC), with the primary aim of locating speaker-sensitive spectral regions. BLCCs are sub-band cepstral coefficients (CCs) which are easily obtained by a linear transformation of full-band CCs. The transformation gives the flexibility of selecting any sub-band region without the recurrent cost of spectral analyses. Using multi-band BLCCs obtained by sliding a 600-Hz sub-band every 400 Hz across the full [0-5kHz] range, FVC experiments were attempted using citation recordings of the 5 Japanese vowels from 297 adult-male, native speakers. The FVC results give locations and ranges for the most speaker-sensitive sub-bands, and show that combining 3-4 of these yields comparable FVC performance with full-band CCs. Owing to their ability to easily extract locally-encoded speaker information from full-band CCs, it can be conjectured that BLCCs have a significant role to play in the search for meaningful interpretations of the numerical outcome of forensic analyses.- Anthology ID:
- 2023.alta-1.5
- Volume:
- Proceedings of the 21st Annual Workshop of the Australasian Language Technology Association
- Month:
- November
- Year:
- 2023
- Address:
- Melbourne, Australia
- Editors:
- Smaranda Muresan, Vivian Chen, Kennington Casey, Vandyke David, Dethlefs Nina, Inoue Koji, Ekstedt Erik, Ultes Stefan
- Venue:
- ALTA
- SIG:
- Publisher:
- Association for Computational Linguistics
- Note:
- Pages:
- 40–50
- Language:
- URL:
- https://aclanthology.org/2023.alta-1.5
- DOI:
- Cite (ACL):
- Shunichi Ishihara and Frantz Clermont. 2023. The sub-band cepstrum as a tool for local spectral analysis in forensic voice comparison. In Proceedings of the 21st Annual Workshop of the Australasian Language Technology Association, pages 40–50, Melbourne, Australia. Association for Computational Linguistics.
- Cite (Informal):
- The sub-band cepstrum as a tool for local spectral analysis in forensic voice comparison (Ishihara & Clermont, ALTA 2023)
- PDF:
- https://preview.aclanthology.org/revert-3132-ingestion-checklist/2023.alta-1.5.pdf