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Acoustics
n/a
25
Music
Undergraduate 1
02/25/2013

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Term
Reflective
Definition
Surfaces in which certain frequencies bounce off easily
Term
Absorptive
Definition
Surfaces that absorb certain frequencies and "deaden" the sound.
Term
Diffusive
Definition
A mix of absorption and reflection. Essentially, diffusors are meant to "scatter" sound. Diffusers may be natural or man made. They may be random or they may follow a mathematical formula.
Term
Convex
Definition
Outwardly rounded. Many diffusers are some type of convex and rarely concave.
Term
Examples of natural diffusers
Definition
petrified wood, tree bark, stone walls, exposed brick, broken brick
Term
Constructed diffusers usually follow the....
Definition
Primitive Root Sequence or the Quadratic Residue Formula.
Term
Diffraction Grating
Definition
General term for a directional diffusers, usually called an RPG if it follows math.
Term
RPG
Definition
Reflection phase grating- minute parallel lines (usually hardwood/plastic filler) that is meant for directional diffusion
Term
Skyline
Definition
Resembles a city skyline. These diffusers follow the QRD formula as well, but are designed to be a "3D" diffuser, providing omnidirectional scattering.
Term
Inverse Skyline
Definition
Same concept as a regular skyline, but the inverse mold of a typical design
Term
Convex Panels
Definition
These types of diffusers are sometime semi-resonators. They trap a certain bandwidth of frequency inside, and scatter higher frequency.
Term
Axial Modes
Definition
Based on the room's three main axes: length, width, and height Between these walls, standing waves (resonance) travel along each axial mode, creating a range of frequencies that are accentuated according to the layout of the room. This is why certain frequencies are heard better in certain parts of the room.
Term
Standing waves
Definition
A wave of sound that bounces between two or more surfaces emphasizing one frequency over others. The area between two parallel walls resonate at certain frequencies; a standing wave IS resonance created by two PARALLEL walls.
Term
First Live Face
Definition
First interference of the primary axial mode. It's good to place an absorber in front of wall to avoid heavy reflection and phasing.
Term
Examples of Absorbers
Definition
Bass traps, Korner Killer (made by aurelex), Baffles, Banners, Clouds
Term
Bass Traps
Definition
Made to generally take in excess bass in a room. They can't be bandwidth oriented in design. THey can only be deep enough to accomodate low frequencies.
Term
Korner Killer
Definition
Made by Aurelex. Specifically meant for installation in corners. May be installed vertically or horizontally.
Term
Two kinds of baffles
Definition
go-bos (go-betweens) and hanging
Term
Go-Bos
Definition
Go-betweens. Mobile baffles, usually reflective/diffusive on one side, absorptive on the other.
Term
Baffles are meant to obstruct reflections between __________ walls
Definition
parallel
Term
kinds of hanging absorbers
Definition
hanging baffles, hanging banners and Clouds
Term
Clouds
Definition
Used to be called "Contra Carpet". flat absorbers that hang parallel to the ceiling. Sometimes they are meant to resonate specific frequencies and may be partially
Term
Splaying
Definition
rebuilding the wall or walls so that they are not parallel with one another. Usually said as "the wall is splayed x degrees"or "the wall is canted x degree". 6 degrees usually the maximum, normally referenced from a window.
Term
Sound Lock
Definition
2 doors installed in series. This is the best method of maintaining the consistency of the wall (or double wall) without using a single, extremely heavy door. The inside of the sound lock should be heavily absorptive
Term
Resonance
Definition
The frequencies that an object vibrates at.
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