Design of the Noise Testing System Based on LabVIEW

Noise level is a key parameter for evaluating the quality of industry equipments and the life environment. The traditional noise test systems have all kinds of disadvantages, for example, the efficiency and precision of testing are low. A new noise test system is developed based on virtual instrument technology which comprises the testing technology, the computer technology and the network technology. In this new system, the sound card of personal computer is used as data acquired card (DAQ card) for acquiring noise signals. So the total test system is more economical. During testing, noise signals are acquired and processed simultaneity by this system. User can obtain the information of the acquired noise signals in time domain and frequency domain. It is known from the actual testing that the test efficiency and precision both are enhanced because of the use of this new system.