Lecture 10 Speaker Identification 2

Lecture 10 Speaker Identification 2 - • Unknown to be...

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LIN 4930 Speaker Identification 2: Aural Perceptual Analysis Methods
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Introduction To complete an AP approach to speaker recognition, a sample of a suspect’s speech (exemplar) can be elicited for purposes of comparison with an evidence recording Exemplar recordings can be: Live Telephone
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Exemplar Elicitation Methods 1. Appropriate recording environment to avoid reverberation in live recording 800ms reverb 2000ms reverb Original sounds in red, reverb in green
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Exemplar Elicitation Methods 2. Use appropriate microphone 3. Make a test recording prior to your live sample 4. For telephone sample: Ensure that recording is made directly from phone line while you monitor separately 5. Elicit various types of speech samples Extemporaneous (most natural, least monitored speech) Evidence text Read speech (full phonetic repertoire) 6. Do not permit speakers to disguise their voice Whisper Monotone
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Comparing exemplars and evidence
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Unformatted text preview: • Unknown to be compared with known – Ex: Voice of criminal on an evidence tape with voice of suspect on exemplar recording – Ex: Multiple suspects, foil voices • Speech materials to be analyzed – Topic-independent sentences (8 – 10) – Topic-dependent sentences (6 – 8) – Same at phrase, word levels AP Analysis Parameters 1. Pitch • Level • Variability • Patterns 1. Voice Quality • General • Vocal Fry • Other 1. Intensity Variability 2. Dialect • Regional • Non-native • Idiolect Two voices are compared and their differences rated on a 1 – 10 scale Means and Ranges are calculated to estimate overall similarity AP Analysis Parameters 5. Articulation • Vowels • Consonants • Misarticulations • Nasality • Other 5. Prosody • Rate • Speech Bursts • Other 5. Other • Nonfluencies • Systematic speech disorders Example 1 Example 2...
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Lecture 10 Speaker Identification 2 - • Unknown to be...

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