No particular sound is singled out for interest.Īmplitude: The instantaneous magnitude of an oscillating quantity such as sound pressure. A room with a lot of reverb is said to be "live" one without much reverb is said to be "dead".Īmbient noise: The composite of airborne sound from many sources near and far associated with a given environment. % Alcons of 0 indicates perfect clarity and intelligibility with no loss of consonant understanding, while 10% and beyond is growing toward bad intelligibility, and 15% typically is the maximum loss acceptable.Īmbience: The acoustic characteristics of a space with regard to reverberation. s/m3) -of a homogeneous material, the quotient of its specific airflow resistance divided by its thickness.Īlcons: The measured percentage of Articulation Loss of Consonants by a listener.The pressure difference and the volume velocity may be either steady or alternating.Īirflow resistivity: * mks rayl/m *(Pa s/m3) -the quotient of the air pressure difference across a specimen divided by the volume velocity of airflow through the specimen.It can also refer to the effect a given environment has on sound.Īirborne sound: Sound that arrives at the point of interest, such as one side of a partition, by propagation through air.Īirflow resistance, R: mks acoustic ohm *(Pa Commonly and especially, a material designed to absorb sound.Īcoustics: The science of sound. The real and imaginary components are called, respectively, acoustic resistance and acoustic reactance.Īcoustic material: Any material considered in terms of its acoustical properties. s/m3) -of a surface, for a given frequency, the complex quotient obtained when the sound pressure averaged over the surface is divided by the volume velocity through the surface.It has a value between 0 and 1 and varies with the frequency and angle of incidence of the sound.Īcoustic impedance: Z=R+jX mks acoustic ohm *(Pa For the test to be scientifically valid the levels should be matched.Ībsorb: Sound waves are converted into energy such as heat that is then captured by insulation.Ībsorption: In acoustics, the changing of sound energy to heat.Ībsorption coefficient: The fraction of sound energy that is absorbed at any surface. For example, a test between two different pre-amplifiers. Insulation, Roofing Shingles and other Owens Corning Building ProductsĪ-B test: A test between two components or rooms.
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