Sound Design Psychoacoustics and Sound Perception 1 — Questions and Answers
Question 1: What does psychoacoustics primarily study?
- The physics of sound wave propagation in air
- The human perception and psychological responses to sound (Correct answer)
- The electronic circuits used in audio equipment
- The mathematical modeling of acoustic spaces
Correct answer: The human perception and psychological responses to sound
Psychoacoustics is the scientific study of how humans perceive sound and how the brain processes auditory information.
Question 2: The Fletcher-Munson equal loudness contours demonstrate that:
- All frequencies are perceived equally loud at any sound pressure level
- Human hearing is less sensitive to very low and very high frequencies at low volumes (Correct answer)
- Low frequencies are always perceived louder than high frequencies regardless of level
- Loudness perception is entirely independent of frequency
Correct answer: Human hearing is less sensitive to very low and very high frequencies at low volumes
Fletcher-Munson curves show that at low SPLs, the ear is less sensitive to bass and treble, requiring more energy at those frequencies to sound equally loud.
Question 3: What is the threshold of hearing (0 dB SPL) defined as?
- The level at which sound causes physical pain
- The quietest sound that can be detected by a young, healthy human ear (Correct answer)
- The average level of conversational speech
- The noise floor of professional recording equipment
Correct answer: The quietest sound that can be detected by a young, healthy human ear
0 dB SPL is the reference pressure (approximately 20 micropascals) corresponding to the softest sound a healthy human ear can detect.
Question 4: The Haas effect (Precedence Effect) states that two identical sounds arriving within 1–40ms are perceived as:
- Two distinct echoes separated in space
- A single sound localized to the direction of the first arrival (Correct answer)
- A louder combined sound from a center position
- A phased or comb-filtered version of the original signal
Correct answer: A single sound localized to the direction of the first arrival
The Haas effect describes how the auditory system fuses early reflections with the direct sound, localizing everything to the first-arriving source.
Question 5: Auditory masking occurs when:
- A sound is recorded using noise-canceling microphone technology
- One sound makes it more difficult or impossible to hear another sound (Correct answer)
- Reverb is applied to reduce the perceived loudness of a signal
- Headphones physically block external ambient noise from reaching the ear
Correct answer: One sound makes it more difficult or impossible to hear another sound
Auditory masking happens when one sound (the masker) reduces the auditory system's ability to detect another sound (the target), due to overlapping frequency or timing.
Question 6: Which physical property of a sound wave primarily determines its perceived pitch?
- Amplitude
- Timbre
- Frequency (Correct answer)
- Phase
Correct answer: Frequency
Frequency, measured in Hertz (Hz), directly determines perceived pitch — higher frequency corresponds to higher perceived pitch.
Question 7: What does 'timbre' (tone color) describe in sound perception?
- The loudness of a sound measured in decibels
- The pitch of a sound determined by its frequency
- The quality that distinguishes sounds of the same pitch and loudness from different sources (Correct answer)
- The duration or sustain of a musical note
Correct answer: The quality that distinguishes sounds of the same pitch and loudness from different sources
Timbre is the tonal quality shaped by a sound's harmonic content and envelope, allowing us to tell a violin from a piano playing the same note at the same volume.
Sound Design Psychoacoustics and Sound Perception 1
What does psychoacoustics primarily study?