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21M.380 Music and Technology Sound Design Lecture 7 Perception of Sound

The document summarizes key topics from a lecture on the perception of sound, including: - How the amplitude, fundamental frequency, and spectrum of a sound relate to its loudness, pitch, and timbre. - An overview of the human auditory system and how we localize sounds based on interaural time and intensity differences. - Factors that influence our perception of loudness, pitch, phantom fundamentals, and short sound attacks. - A preview of an upcoming soundwalk exercise to analyze ambient sounds in the environment.

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94 views3 pages

21M.380 Music and Technology Sound Design Lecture 7 Perception of Sound

The document summarizes key topics from a lecture on the perception of sound, including: - How the amplitude, fundamental frequency, and spectrum of a sound relate to its loudness, pitch, and timbre. - An overview of the human auditory system and how we localize sounds based on interaural time and intensity differences. - Factors that influence our perception of loudness, pitch, phantom fundamentals, and short sound attacks. - A preview of an upcoming soundwalk exercise to analyze ambient sounds in the environment.

Uploaded by

scribddmail
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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21M.

380 Music and Technology


Sound Design
Lecture 7
Perception of sound
Wednesday, February 24, 2016

1 Perception of sound
1.1 Perception of harmonic spectra
Demo with Baudline (http://baudline.com/)
Amplitude relates to loudness
Fundamental frequency relates to pitch
Spectrum relates to timbre

1.2 Human auditory system


Outer ear (pinna, auditory canal, ear drum)
Middle ear (3 ossicles act as impedance transformer)
Inner ear (filled with fluid, cochlea contains basilar membrane with
haircells connected to auditory nerve)

1.3 Sound localization


Accurate sound localisation is supported by (Farnell 2010, sec. 6.1):
High-frequency sounds with sharp attacks
Free space without reflections
Ability of listener to move head

Two important cues (complement each other over audible frequency


range):
Interaural time differences (ITD)
Interaural intensity (or level) differences (IID)
Exercise: Whats the maximum ITD wed expect?

1.4 Loudness perception


Equal loudness contours

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21M.380, Lecture 7 (Wed, 2/24/2016)

1.5 Pitch perception


Rhythm-pitch continuum (as the frequency of a pulse train increases)
Phantom fundamental:
The pitch of a harmonic spectrum is perceived at its fundamental
frequency even if that frequency itself is absent.
Exercise: Writing a Pd patch to illustrate this phenomenon

1.6 Perception of short attacks


Attack times of less than 10 ms are generally heard as a click. (Farnell
2010, p. 89)
Lets verify this in Pd

2 Preview: Soundwalk
Westerkamp (2007) reading was due today
If you havent read it yet, please do so before Tue
For next class meeting, please bring coats (and little else)!

References and further reading


Farnell, Andy (2010). Designing Sound. Cambridge, MA and London:
MIT Press. 688 pp. isbn: 978-0-262-01441-0. mit library: 001782567.
Hardcopy and electronic resource.
Westerkamp, Hildegard (2007). Soundwalking. In: Autumn Leaves. Sound
and the Environment in Artistic Practice. Ed. by Angus Carlyle. Paris:
Double Entendre, pp. 4954. isbn: 978-0-9548074-3-6. mit library:
002198647. Available in a slightly different version at http : / / cec .
concordia.ca/econtact/Soundwalk/Soundwalking.html.

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MIT OpenCourseWare
http://ocw.mit.edu

21M.380 Music and Technology: Sound Design


Spring 2016

For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms.

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