Research on visual instrument for reverberation time measurement based on pulse response

According to Schroeder backward integration principle,the virtual instrument Sound Express to measure reverberation time is developed based on graphical programming language LabVIEW8.6.The key problems of signal processing such as acquisition of pulse response,filtering,signal denoising and sound pressure level curve fitting are researched in depth.The composition of Sound Express measuring system and the program frame are introduced in detail.The measuring performance of Sound Express is verified by experiments,and it is show that the Sound Express has reliable measurement results and stable performance.