Term
| What 4 things aid a private and non-obtrusive conversation? |
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Definition
absorbent materials
absorbing/diffusing barriers
airtight construction
masking speech |
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Term
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Definition
normal
confidential
transitional |
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Term
| What 3 things mask sound? |
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Definition
white noise
music
electronic cancelation |
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Term
| If a tree falls in the forest...is there sound? |
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Definition
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Term
| For sound to exist, three things must be present |
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Definition
source
transmission path
receiver |
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Term
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Definition
| The branch of physics that deals with the production, control, transmission, reception and effects of sound. |
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Term
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Definition
| A vibrating onbect radiates sound waves outward from the source equally in all directions until they hit a surface that either reflects or absorbs them. |
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Term
| What are sound waves measured in? |
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Definition
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Term
| What are the 3 ways you mechanically measure sound? |
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Definition
wavelength
frequency
amplitude |
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Term
| What are the 3 ways you measure sound perception? |
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Definition
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Term
| What is the difference between music and noise? |
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Definition
| music is pleasant, noise is unpleasant |
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Term
| What is the definition of reflected sound? |
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Definition
| when a sound wave strikes a surface that is large compared to the wavelength, a portion of the sound energy is reflected and a portion is absorbed. |
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Term
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Definition
| the persistence of sound after the source of the sound has ceased |
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Term
| How do you define the reverberation time of a space? |
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Definition
| the amount of time that sound bounces around a room before dying out to inaudible levels |
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Term
| What benefits from longer reverberation times? |
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Definition
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Term
| What benefits from shorter reverberation times? |
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Definition
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Term
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Definition
| the decresase in energy or pressure for each unit area of a sound wave. |
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Term
| What is natural sound reinforcement? |
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Definition
| the amplification of sound being heard from various reflections as well as directly from a source |
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Term
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Definition
| when repetitions of a sound are produced by reflection of sound waves from a surface, loud enough and received late enough |
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Term
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Definition
| the effect when sound waves are rapidly reflected back and forth between two parallel flat or concave surface |
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Term
| Where do flutters often occur? |
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Definition
| in shallow domes and hard flat surfaces |
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Term
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Definition
| perceived points of quiet and of maximum sound within a room |
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Term
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Definition
| sounds that are reflected from a concave surface converging at a single point |
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Term
| What is the creep phenomenon? |
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Definition
| the reflection of sound along a curved surface from a source near the surface |
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Term
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Definition
| when sound is absorbed, the sound energy flows through the absorptive material as heat |
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Term
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Definition
| when two separate sources of sound are perceived simultaneously, those sounds tend to obscure each other |
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Term
What are these two lessons from?
1) The difficulty to remedy a space that is initially built with poor proportions
2) an example of how inexact the process of acoustic design can be |
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Definition
| the lessons of Fogg lecture hall |
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Term
| Reducing sound can be achieved by: |
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Definition
separating
enclosing
absorbing
canceling |
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Term
| When all of the sound energy striking the material is ABSORBED, and none of it is reflected, the absorption coefficient is ________ |
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Definition
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Term
| When all of the sound energy striking the material is REFLECTED, and none of it is absorbed, the absorption coefficient is _______. |
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Definition
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Term
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Definition
| noise reduction coefficient |
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Term
| What does a material's sound absorption depend on? |
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Definition
thickness
density
porosity
resistance to air flow |
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Term
| Paths must extend from one side of the material to the other, so that ______ passes through |
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Definition
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Term
| Materials absorb acoustic energy by the friction of air being moved in the tiny spaces between _______. |
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Definition
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Term
| What is the most important surface to treat for sound absorption? |
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Definition
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Term
| What are examples of mechanical building noise? |
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Definition
HVAC
lighting
plumbing
elevators
transformers |
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Term
| How to reduce mechanical building noise... |
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Definition
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Term
| all sound transmission involves both ________ and __________ sound |
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Definition
| airborne and structure-borne |
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Term
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Definition
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Term
| What is Transmission loss? |
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Definition
| the measure of the performance of a building material or construction assembly in preventive transmission of airborne sound in a wall |
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Term
| what is transmission load related to? |
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Definition
physical characteristics
mass
rigidity
materials of construction
method of constriction and attachment |
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Term
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Definition
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Term
| Whether we perceive sound as high or low depends on its ___________. |
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Definition
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Term
| The measure of the power of sound is known as __________. |
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Definition
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Term
| ______ _______ are the result of a vibrating object and they move outward from the source until they hit a surface that either reflects or absorbs them. |
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Definition
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Term
| Reflected sound leaves the surface at an angle equal to the angle at which it strikes. t/f |
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Definition
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Term
| Interior activities with higher noise levels should be located on the noisier side of the building. t/f |
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Definition
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Term
| The larger the absorbtion coefficient the less capable materials are at absorbing sound. t/f |
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Definition
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Term
| Describe acoustic diffraction |
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Definition
| sound waves bending around barriers or through openings |
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Term
| Installing absorptive materials directly to walls is the most effective installation method for materials that absorb sound. t/f |
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Definition
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