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| The control of sound which originates within an enclosure |
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| The control of sound between or into an enclosure |
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| vibration cycles per second (measured in Hz) Determines sound pitch. |
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| distance between identical points on a wave |
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| units of measure for sound intensity. |
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| rate at which sound travels through a conductor |
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| segment of the overall sound wave that travels in a direct line to the listeners ears |
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| sending a sound wave in many different directions to reduce volume |
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| sound bouncing off an object. shape of the space determines the sound path. |
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| sound can bend around objects of travel through small openings |
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| the perpetuation of reflected sound within a space after the source has ceased |
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| reverberation time (in seconds) |
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| (.05 X Volume of Room(ft^3))/sabins |
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| absorption is measured in |
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| sound absorption of one squarefoot of material. |
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| the perfect absorptive surface would be |
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| Good Acoustical Characteristics |
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Definition
reflective surfaces towards the front of the space.
absorptive surfaces towards the rear. |
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| Acoustical environments are either: |
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| A Live acoustical environment is |
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| A Dead acoustical environment is |
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| acoustic system the absorbs more energy at certain frequencies |
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creating a good acoustical environment for occupant.
should be shielded from annoyance and distractions. |
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| certain amounts of continuous sound can be tolerated (or welcomed) before it becomes noise |
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| preferred noise criterion |
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| noise levels above 60db are not recommended |
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| Minimizing background noise |
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| controlling airborn sound |
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| mass (weight), isolation (decoupling),absorption |
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| continuous rigid connections between spaces that allow unwanted noise to be transferred, such as: plumbing pipes, air ducts, electrical conduit |
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| STC (Sound Transmission Class) |
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Definition
| Rating of how well a building partition dims airborn sound |
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| NRC (Noise Reduction Coefficient) |
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| amount of sound energy absorbed upon striking a particular surface |
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| CAC (Ceiling Attenuation Class) |
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| Measure of the sound transmission loss as noise travels between rooms. (Essentially, it is the ability of a ceiling panel to block sound between rooms.) |
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| using more desirable sounds to cover up less desirable sound. creating additional background noise. |
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| function of good acoustical design. |
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