System and method for seamless roaming over scalable wide area Wireless LAN networks with clientless mobile subscribers. Because input and output sentences are written in different languages, automatic speech translation requires techniques for processing different languages. A second voltage signal is applied to the switching gate to switch the MOSFET from the blocking to the conduction mode. The filter is applied in the frequency domain where time-domain convolution becomes a much more efficient component-wise multiplication with an in-place window. An iterative data processing method optimizes the accuracy of the measured flowstream parameters.