Time Frequency Analysis and FPGA Implementation of Modified S- Transform for De-noising

A new approach to modified S-transform based non-stationary power signal de-noising is presented in this paper. Modified S-transform is employed in de-noising techniques to separate high frequency noise which is prevalent in practical signals like power disturbance signals from the low frequency undistorted signals. In this we have tried to bring out the advantage of the modified S-transform and its application in power signal analysis through various examples. S-transform with modified Gaussian window is found to provide excellent normalized frequency contours of the power signal disturbances suitable for accurate detection, localization and classification. The implementation of the de-noising scheme has been carried out in FPGA using non-stationary power signals. Key words– Non-Stationary signals, power signal disturbances, modified S-transform (MST), modified Gaussian window, scaling factor, time-frequency resolution, de-noising, FPGA.