This invention relates to a power recovery process in waste steamCO2 reformers whereby a waste stream can be made to release energy without having to burn the waste or the syngas. The invention also incorporates a resolution filter bank, or a tri-mode resolution filter bank, which is selectively switchable between high and low frequency resolution modes or high, low and intermediate modes such as when detecting transient in a frame. In the information read operation, three different kinds of voltages are applied to a word line, three kinds of two-value information so read out are synthesized by a read conversion circuit and the memory information of the memory cell are converted to the two-bit information.