Voice Analysis Quiz Crafted by -
Dr. Mukesh Sharma
Assistant Director (Physics)
State Forensic Laboratory, Jaipur
Rajasthan, India
Introduction to Voice Analysis
Experts in forensic voice analyze recordings by examining transmitted and stored speech, enhancing it and decoding it for criminal investigations, court trials, and federal agencies. To utilize audio recordings in court, a forensic phonetician must authenticate the recording to detect tampering, enhance the audio, and interpret the speech. Their first job is to ensure that the speech in the recording being used is comprehensible. Oftentimes, samples have poor sound quality due to environmental factors such as wind or movement. Other times the sound degradation is due to technological issues within the recording device. Any investigative work on speaker identification cannot be done until the recording is of proper quality. Different solutions for poor comprehensibility are done using computer programs that allow the user to filter and eliminate noise. Computer software is also able to convert the speech to spectra and waveforms, which is useful for the forensic phonetician. However, any work done on the recording should be done after a copy of the original recording is made.
Let's look at the questions and their answers.
Que 1. Loudness of sound is determined by
a) Pitch
b) Frequency
c) Amplitude
d) Time period
Answer - a) Pitch
Que 2. The frequency of subsonic sound is
a) More than 20 Hz
b) 100 Hz
c) Less than 20 Hz
d) More than 20 K Hz
Answer - c) Less than 20 Hz
Que 3. Pitch of the sound determined by its
a) Frequency
b) Speed
c) Amplitude
d) Loudness
Answer - a) Frequency
Que 4. Hearing range of human ear is
a) 20 Hz to 20 KHz
b) More than 20 KHz
c) Less than 20 Hz
d) 20 Hz than 25 K Hz
Answer - a) 20 Hz to 20 KHz
Que 5. Sound intensity is defined as:
a) The sound power per unit volume.
b) The sound energy passing through a unit of area per unit time.
c) The sound power per unit time.
d) The sound energy passing through a unit of area.
Answer - b) The sound energy passing through a unit of area per unit time.
Que 6. Voice of a man is heavy compared to woman because –
a) Female vocal cord is longer
b) Male vocal cord is Shorter
c) Male vocal card is longer
d) Concept is not related
Answer - a) Female vocal cord is longer
Que 7. Voice box is called –
a) Vocal cord
b) Glottis
c) Larynx
d) Mouth
Answer - c) Larynx
Que 8. Which of these terms refer to the study of speech process?
a) Phonology
b) Phonetic substances
c) Phonetics
d) Semantics
Answer - c) Phonetics
Que 9. Which of these terms refer to the study of hearing and perception of speech sounds?
a) Articulatory phonetics
b) Acoustic phonetics
c) Auditory phonetics
d) Laboratory phonetics
Answer - c) Auditory phonetics
Que 10. Which of these are sound made with air passing through the nose. Examples include m, n, and ng sound of sing.
a) Nasal
b) Uvula
c) Velum
d) Bilabial
Answer - a) Nasal
Que 11. Which of these is not a type of phonetics?
a) Articulatory
b) Personal
c) Acoustic
d) Auditory
Answer - b) Personal
Que 12. What does the sign / / represent?
a) Phonetic transcription
b) Centralization
c) Voiced bilabial nasal
d) Rising- falling pitch
Answer - a) Phonetic transcription
Que 13. The individual credited with creating voiceprint technology was
a) Wilhelm Greiss
b) Lawrence Kersta
c) Clifford Irving
d) David Coy
Answer - b) Lawrence Kersta
Que 14. The American Board of Recorded Evidence has ____ categories in which an examiner can classify a voice recording.
a) 5
b) 9
c) 3
d) 7
Answer - d) 7
Que 15. A “positive identification” of a voice recording is made when there are at least:
a) 10 matching speech sounds
b) 15 matching speech sounds
c) 20 matching speech sounds
d) 5 matching speech sounds
Answer - c) 20 matching speech sounds