Acoustics - General - Theoretical

Links of general interest (no suppliers or material) as documents/calculation/link collections etc.

Acoustics - General - Theoretical

Postby Dan Nelson » Sun Feb 08, 2004 11:56 pm

Diffusion, Scattering related to Reverb


Reverberation time, diffuse reflection, Sabine, and computerized prediction - part I
What effect has diffuse reflection on the RT? Will diffuse reflection always affect the RT? What effect has diffuse reflection on Sabine RT estimates? Will not formulas such as Fitzroy and Arau-Puchades solve the problem?
http://www.rpginc.com/research/reverb01.htm


 
Reverberation time, diffuse reflection, Sabine, and computerized prediction - part II
Does diffuse reflection have to be taken into account? How can diffuse reflection be handled in a CP program? Must diffuse reflection be handled with frequency dependence? How can scattering coefficients be estimated? How will diffuse reflection affect auralization?
http://www.rpginc.com/research/reverb02.htm

Haas effect

The Haas Effect
Haas Effect Also called the precedence effect, describes the human psychoacoustic phenomena of correctly identifying the direction of a sound source heard in both ears but arriving at different times. The Haas Effect tells us that humans localize a sound source based upon the first arriving sound, if the
http://www.utexas.edu/cofa/music/ems/mu ... /Haas.html

Hemholtz Resonator

Helmholtz - Who he was, what he did.
Hermann Ludwig Ferdinand von Helmholtz. Born: 31 Aug 1821 in Potsdam, Germany; Died: 8 Sept 1894 in Berlin, Germany.
http://www-groups.dcs.st-andrews.ac.uk/ ... holtz.html

Helmholtz Resonance
A Helmholtz resonator or Helmholtz oscillator is a container of gas (usually air) with an open hole (or neck or port). A volume of air in and near the open hole vibrates because of the 'springiness' of the air inside. A common example is an empty bottle: the air inside vibrates when you blow across the top.
http://www.phys.unsw.edu.au/~jw/Helmholtz.html
 
Helmholtz Resonator
A more matematical approach
http://scienceworld.wolfram.com/physics ... nator.html
 
Helmholtz resonator
A simple test method
http://www.me.psu.edu/lamancusa/me458/lab9.pdf

Model of a Helmholtz Resonator
Model of a Helmholtz Resonator simple picture
http://www.tcm.rmit.edu.au/imtp/Sound/K ... mholtz.htm
 
Small Recording Studio Room Acoustics and Helmholtz Resonators
A more studio approach, includes a wooden slat type Helmholtz absorber.
http://w3.one.net/~robgrow/helmhltz/helmhltz.html

LEDE (Live End Dead End) Rooms

ATTACK Wall ™ 5.1 from Acoustic Sciences Corporation
Recording studios design is based on the well known "LEDE" type principle. Here we see a sound level in dB vs time in milliseconds sketch of the ETC or Energy Time Curve that defines the LEDE type acoustic signature.
http://www.acousticsciences.com/surround/seminar-04.htm
 
Chip Davis Designs
Some minor biography
http://www.chips-davis.com/qual.html
 
Echo and Reverberation
LEDE & Splayed wall design
http://www.muselogic.com/acoustics.html
 
LEDE Live End Dead End
What do LEDE Rooms and Concert Halls Have in Common?
http://www.jdbsound.com/art/art517.html

On-line Courses related to the physics of acoustics.

Acoustics FAQ
The world-wide most referred FAQ about acoustics
http://www.campanellaacoustics.com/FAQ.htm

BST2522 Building Environmental Science 2
Apple Chan's courses. My name is Chan, Lok Shun Apple. I am a lecturer in the Division of Building Science & Technology, City University of Hong Kong.
http://personal.cityu.edu.hk/~bsapplec/newpage3.htm

Course Notes for Physics 114, Theory of Sound With Applications to Speech and Hearing Science
On-line Course Notes: An extensive interesting series on-line notes about sound, acoustics etc.
http://www-unix.oit.umass.edu/~phys114/ ... Index.html

Education Net
Check out: Wave, Motion and Sound Parts I, II & III
http://www.education.eth.net/acads/physics/physics.htm
 
HANDBOOK FOR ACOUSTIC ECOLOGY
SUPER COMPLETE HANDBOOK explaining about any acoustic notion (not in-depth): In a sense, the book has been waiting for this new format all of its life. The original cross-referencing scheme now active links which when clicked will take you the appropriate term.
http://www.sfu.ca/sonic-studio/handbook/
 
HyperPhysics - Sound and hearing
HyperPhysics is an exploration environment for concepts in physics which employs concept maps and other linking strategies to facilitate smooth navigation.
http://hyperphysics.phy-astr.gsu.edu/hb ... tml#soucon
 
Music Acoustics - Univ New South Wales, Sydney Australia
A VERY GOOD SITE. A huge number of cross-links will guide you through lots of acoustic toppics.
http://www.phys.unsw.edu.au/music/
 
NOISE HANDBOOK
The objective of environmental noise control is to improve the acoustic environment in a community by reducing noise levels. Noise from industrial operations can affect neighboring residential areas, ranging from intolerable noise levels to structural vibrations. Well-planned noise control can eliminate a major component of an industrial site’s impact on its surrounding environment. Noise control is based on what we know about how sound behaves. For this reason, our look at some of the fundamentals of environmental noise control begins with basic descriptions of sound and noise, acoustic materials, and attenuation.
http://www.atconoise.com/mediaroom/NOISE_HANDBOOK.pdf
 
Newcastle College: Acoustics & Studio Technology
Very interesting link. Covers all aspects of studios, acoustics, soundproofing and much more. This site is really an extensive comprehensable overview, with lots of additional links.
http://home.clara.net/gcat/acoustics/acoustics.htm
eric_desart
 
 
 

 
The Physics Classroom: a High school physics tutorial
Check out the "Waves" and "Sound Waves and Music" menu items
http://www.physicsclassroom.com/Default2.html
 
The Soundry: Very Good tutorial starting from the basics.
The Soundry is an exciting, interactive, and educational web site about sound. Covering everything from the most basic concepts of what sound actually is to the specifics of how humans perceive it, The Soundry aims to promote enthusiasm and knowledge of sound. This site won several awards and is sponsered by Microsoft itself.
http://library.thinkquest.org/19537/
 
UCSC Electronic Music Studios
Check out the "Technical Background" section. Note this site includes also lots of course info for electro acoustics, equipment etc.
http://arts.ucsc.edu/EMS/Music/table.html
 
Waves, Acoustics and Vibration
The World of Waves; The Severn Bore. University of Denver - Dr James B. Calvert
http://www.du.edu/~jcalvert/waves/soundwav.htm


 
Dan Nelson
 
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