 |
Criterion (Various Units) |
| he physical or behavioral response which is to be achieved by mitigation in an acoustical design. The criterion may specify be expressed as a behavioral metric such as annoyance or speech intelligibility. It may also be expressed as specify objective sound level. |
 |
|
Coincidence frequency (dip or notch) |
| The frequency at which a sound wave incident upon a surface has a projected wave length equal to the length of the bending wave excited in the surface material. The effect of this "trace matching" is a marked reduction in the sound transmission loss in the frequency region in which this occurs. The frequency is a function of the angle at which the sound impinges on the surface, the surface weight, and bending stiffness of the surface |
|
|
Composite Noise Rating |
| A single value metric which includes the effect of the ambient sound level, the emitted sound level, and other factors related to intermittency, time of operation, and others. |
|
|
