An N-channel FDM signal is converted into complex signals of baseband frequencies spaced at intervals equal to frequency .DELTA.f. The complex baseband signals are converted first into digital samples having a frequency N.DELTA.f and then into N parallel digital signals. A plurality of first FIR subfilters...http://www.google.es/patents/US4785447?utm_source=gb-gplus-sharePatente US4785447 - FDM demultiplexer using oversampled digital filters
FDM demultiplexer using oversampled digital filters
