Multimedia Forensics: Voice Analysis and Vocal Apparatus Basics
Published:
Questions
30
Duration
30 min
Faculty-reviewed
0
Updated
26 May 2026
About this mock
UGC-NET Forensic Science Unit VIII drill on voice analysis and the vocal apparatus. Covers the anatomy of speech production from the lungs and trachea through the larynx, vocal folds, pharynx, oral cavity, and nasal cavity, the source-filter theory of phonation (Fant, 1960), fundamental frequency (F0) and its gender-typical ranges (male 85-180 Hz, female 165-255 Hz), and the formant structure (F1 through F4) that encodes vowel identity and speaker characteristics. The voice spectrogram (sonogram) is examined including the Bell Labs sonograph introduced by Potter, Kopp, and Green in 1947 through "Visible Speech", and the contrast between wide-band and narrow-band display modes and what each reveals about time detail versus harmonic structure.
The forensic phonetics module covers phoneme inventory variation across Indian languages including Hindi, Tamil, and Bengali, prosodic features such as pitch, stress, rhythm, and duration, inter-speaker versus intra-speaker variation, and recording standards for casework (minimum 8 kHz sample rate, 16-bit depth). Indian institutional context includes the audio-forensics units of the Central Forensic Science Laboratories at Hyderabad, Chandigarh, and Kolkata, and the professional guidelines of the International Association for Forensic Phonetics and Acoustics (IAFPA) and the European Network of Forensic Science Institutes (ENFSI).
Topics covered:
- Vocal apparatus anatomy: lungs, trachea, larynx, vocal folds, pharynx, oral and nasal cavities
- Source-filter theory: phonation source and vocal-tract resonance filter
- Fundamental frequency (F0) and gender-typical pitch ranges
- Formants F1 through F4 and their role in vowel and speaker identification
- Voice spectrogram (sonogram): axes, wide-band vs narrow-band, forensic "voice print"
- Bell Labs sonograph (Potter, Kopp, Green 1947) and "Visible Speech"
- Phonemes, prosody, inter-speaker and intra-speaker variation
- CFSL audio units; IAFPA and ENFSI guidelines; forensic recording standards
Calibrated for first-pass UGC-NET Forensic Science Paper II preparation and NFSU MSc Forensic Science entrance revision. Allow 30 minutes.
Sources & references
Questions in this mock are written and verified against the following sources. Citations are recorded per question and shown in the explanation after submission.
- cited in 18 questions
Rose, Philip — Forensic Speaker Identification, CRC Press, 2002
Chapter 3: Acoustic Features — F0 ranges for male and female speakers
- cited in 9 questions
Maher, Robert C. — Principles of Forensic Audio Analysis, Springer, 2018
Chapter 3: Speech Analysis Methods — wide-band and narrow-band spectrogram settings
- cited in 3 questions
Hollien, Harry — The Acoustics of Crime: The New Science of Forensic Phonetics, Plenum Press, 1990
Chapter 6: Speaker Identification — the voice print analogy and its limitations
How our mocks are built
Questions are written and edited by the ForensicSpot team and cited from peer-reviewed forensic textbooks, official syllabi and primary case law. Each one is verified before publishing. Detailed explanations show after you submit, so the test stays a real test. See a mistake? Tell us.
Common questions
What does the Multimedia Forensics: Voice Analysis and Vocal Apparatus Basics mock cover?+
UGC-NET Forensic Science Unit VIII drill on voice analysis and the vocal apparatus. Covers the anatomy of speech production from the lungs and trachea through the larynx, vocal folds, pharynx, oral cavity, and nasal cavity, the source-filter theory of phonation (Fant, 1960), fundamental frequency (F0) and its gender-typical ranges (male 85-180 Hz, female 165-255 Hz), and the formant structure (F1 through F4) that encodes vowel identity and speaker characteristics. The voice spectrogram (sonogram
How many questions and how long is the test?+
30 multiple-choice questions, 30 minutes total. Difficulty: easy. Tier: Premium.
Who is this mock for?+
Forensic science students and aspirants who want timed, exam-style practice with explanations and verified source citations on Multimedia Authentication and Deepfake Forensics, NET. Useful for postgraduate entrance preparation and for BSc / MSc forensic students testing their recall under time.
Are the questions reviewed?+
Each question carries a verified source citation. Faculty review for individual questions is in progress.
Do I need an account to take this mock?+
Yes, a free ForensicSpot account is required to start a timed attempt — this lets you save progress, see per-question explanations after submission, and track your topic-level performance over time.