Two channels random acoustics simulation and multichannel data acquisition

The main use of random shaker-control systems is to reproduce, by mean of appropriate signals applied on shakers, predetermined power spectral densities at the output of sensors; the predetermined spectra may be previously computed on a theoritical basis or measured in the actual environment which we want in fact to reproduce. This closed-loop computer-based digital system allows the realisation of auto and cross spectral densities equal to those of the responses previously computed. Its possibilities are large (for instance road and runways profiles). The problems to be solved are: multiple input-output system identification, multiple true random signal generation and real-time-programming.