Kerf
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Kerf
- A slice cut into the edge of an acoustical panel so that it can accept a spline (extrusion) to connect and mount an adjoining panel, providing a level surface at the joint or seam.
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Isolation
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Isolation
- Resistance to the transmission of sound by materials and structures. The separation of airborne or mechanically transmitted energy.
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Inverse square law
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Inverse square law - Any condition in which the magnitude of a physical quantity follows an inverse relationship to the square of the distance. In pure spherical divergence of sound from a point source in free space, the sound pressure level decreases 6 dB for each doubling of the distance.
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Intensity
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Intensity - The amount of sound energy radiated per unit area, measured in watts per square centimeter.
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Initial time-delay gap
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Initial time-delay gap (signal delay) - The time interval between the arrival of a direct sound and its first reflection from the surfaces of the room.
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In phase
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In phase
- Two periodic Wavesreaching peaks and going through zero at the same instant are said to be “in phase”.
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Impulse
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Impulse - A very short, transient, acoustical (or electrical) signal.
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Impaling Clip
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Impaling Clip (also: Impaler) - A mounting fastener that is a metal plate with tines (prongs or spikes) sticking out of it. It is used along with adhesive to mount acoustical panels. The impaling clip is attached to the wall with the tines facing outward and the panel is pushed onto it (impaled).
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Impact noise
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Impact noise - The noise heard as a result of vibrations transferred through the structure of a room. Foot thumps are impact noise.
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Impact Isolation Class (IIC)
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Impact Isolation Class (IIC) - A system for rating the ability of a structure to isolate impact noise (i.e. footsteps, and other vibrational disturbances). Normally used in reference to floor and ceiling constructions, the IIC method utilizes whole positive numbers for rating purposes.
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