DyViS Corpus
Definition
The Dynamic Variability in Speech corpus (Nolan et al., 2009), a UK English speaker database collected under conditions designed to simulate forensic casework (formal interview and informal telephone speech from the same speakers). A primary background population resource for UK English speaker comparison.
- Full name
- Dynamic Variability in Speech corpus
- Compiled by
- Nolan et al., 2009
- Language/accent
- UK English
- Speech styles
- Formal interview and informal telephone speech
- Primary use
- Background population for UK speaker comparison
Common questions
Why does DyViS record two speech styles from the same speaker?+
Forensic casework typically compares a formal police interview or courtroom recording against an informal telephone call, such as an intercepted line. Having both styles from the same speakers lets researchers model realistic within-speaker variation rather than only between-speaker differences.
What role does a corpus like DyViS play in a likelihood-ratio analysis?+
It supplies the reference or background population against which the similarity and typicality of two questioned recordings are measured. Without a matched population, an examiner cannot say how common or rare a given voice feature is.
Related terms
- Bharatiya Sakshya Adhiniyam 2023 (BSA 2023)
- India's evidence law replacing the Indian Evidence Act 1872, governing admissibility of expert testimony (Section 39) including forensic phonetic evidence. Does not...
- Code-Switching
- Shifting between different registers or even different languages within an interaction, often as a signal of role or authority. An interviewer who...
- Formant
- A resonance peak in the vocal tract filter; F1 and F2 together characterise vowel quality (height and frontness), while F3 and higher...
- IAFPA (International Association of Forensic Phonetics and Acoustics)
- The professional organisation for forensic phoneticians, founded in 1991 following the collapse of the voiceprint paradigm. Maintains a code of conduct, annual...
- Lexical Tone
- A tone system in which F0 patterns carry word-meaning distinctions. Mandarin (four tones) and Punjabi (three tones) are the forensically most common...
- Long-Term Average Spectrum (LTAS)
- The averaged spectral energy distribution across a long recording segment, capturing the habitual spectral envelope of a speaker's voice. Useful as a...
- Praat
- Open-source acoustic analysis software developed by Paul Boersma and David Weenink at the University of Amsterdam, used by virtually all forensic phoneticians...
- Speaker Profiling
- The use of phonetic and linguistic features to infer a speaker's regional origin, language background, age, sex, or social group from a...
- Voice Onset Time (VOT)
- The interval between the release of a stop consonant closure and the onset of vocal fold vibration for the following vowel. VOT...