Sound transmission loss ( TL ) is the quantity which indicates the sound insulation performance of board materials or the wall structure. It has widely been used for construction materials such as wall panels or doors, and automobile parts such as doors or dashboards. The measurement is implemented by setting up a sample between two measurement rooms, "Source Room" and "Receiving Room", and the TL is calculated from the comparison between the incident power into the sample and the transmission power through it. To obtain input and trasmitted power, we need to measure several points in each room. If the microphone is moved manually, the measurement would be a very time-consuming job. With this system, it can be moved automatically by using the microphone traverse system. Thus, a large amount of labor hours for measurement is saved.
With this system, you don't need an expensive real-time octave band analyzer. TL is calculated from the incident power and the transmission power. The incident power is measured by the sound pressure level (SPL) in the reverberation room which is used as "Source Room", and the transmission power is measured by the sound intensity in the anechoic room which is used as "Receiving Room". This system includes the octave band analyzer software with the function measuring the sound intensity. Thus, you can construct the system without too much cost.
|Method||Sound intensity method (ISO 15186-1,JIS A1441-1), London's method|
|Frequency bands||200 - 5000 Hz
(An example case, the spacer for sound intensity probe: 12 mm,
sample size of sample: 1000 x 1000 (mm))
|Operating system||Microsoft Windows XP|
Input: 3 channels or more
Output: 4 channels or more
(Ask for the the recommendations)
|GPIB interface||Ask for the recommendations|
|Microphone Traverse System||Microphone traverse (three axes, MT Series)
Microphone rotator (MR Series)
* Manual operation of microphone traverse or the microphone rotator is supprted.
|Others||Ask for the details|