Digital filter bank

摘要

De/multiplexer of frequency bands having HMM cells in a tree structure, the sampling rate being lowered/raised in each stage by the factor 2, characterised in that in the individual stages real and imaginary parts of the respective input signal are alternately fed into HMM-TM cells, the number of the time-delay elements of each HMM-TM cell is doubled with respect to that of a conventional HMM cell, for the purpose of sequential recording and intermediate storage of alternating real and imaginary parts and real and imaginary parts of the respective output signal are read out of the HMM-TM cell alternately in the individual stages. As a result, large reduction in outlay on hardware and in power consumption. Use in multichannel systems, in particular for satellite mobile radio telephone service. <IMAGE>