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In this paper we present a new filter bank design for the Split Spectrum algorithm based on the use of variable bandwidth filters equally spaced in frequency and energy gain equalized. We also use the pruning technique to reduce the number of bands required in order to increase the algorithm efficiency. Frequency Multiplication (FM) recombination method is revealed as the best option when combined with the foregoing techniques. Signal to Noise Ratio enhancement factor was selected as the figure of merit to make the comparisons among the different methods, showing the results obtained after simulations using non stationary models for the grain noise and from real scans obtained in laboratory from pieces of cement. The interest of the proposed new filter bank structure combined with the pruning and the FM recombination method is verified by the showed results.