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Sound Reduction of a Wall or Floor

The sound reduction index measurement of a wall or floor will typically be performed under laboratory conditions. The test specimen is mounted in a test frame between two test rooms and submitted to the diffuse sound field in the emission room. The sound pressure levels are measured in the emission room and in the receiving room according to the ISO 140 series [70]. Measurements are also possible using sound intensity measurements on the receiving side according to ISO 15186 [71].

Impact Sound Level of a Floor

The impact sound level of a floor can be measured under laboratory conditions using an impact machine. The test specimen is mounted horizontally in a test frame between two reverberant rooms. Sound pressure levels are measured in the receiving room according to ISO 10140-3 [72].

Absorption Coefficient

The absorption coefficient can be measured under diffuse field conditions using a reverberant room according to ISO 354 [73]. It can also be measured under normal incidence using a wave tube according to the ISO 10534 series [74]. Due to the standardized procedure in which diffraction may appear on the edges of the sample and the sound field in the test room may be affected by a significant absorptive area some test reports will give a greater than 1 value.

 
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