Filter bank

Details Filter bank Filter bank

H - Electricity

04

J

363/8, 328/0.3

H04J 1/02 (2006.01) H03H 17/02 (2006.01) H03H 17/06 (2006.01) H04J 4/00 (2006.01)

Patent

CA 1291279

27371-183 ABSTRACT OF THE DISCLOSURE A filter bank for frequency demultiplexing or multiplex- ing, respectively, of L channel signals. The filter bank is com- posed of L transversal filters (non-recursive filters, that is filters having an impulse response of finite duration having com- plex valued coefficients, for real value input signals and complex value output signals and vice versa and a sampling rate at the output which is reduced or increased, respectively, by a factor of M. At least one of the L filters is realized by cascading at least two filters each having complex valued coefficients; in each one of these filters F1, ... Fq, ... FQ, the sampling rate is reduced or increased, respectively, by a factor of Mq > 1 and Image = M; In the case of demultiplexing, the filter bank is arranged so that the input filters of each cascade receives a real value input signal and puts out a complex value output signal. The other filters of each cascade each receive a complex value input signal and put out a complex value output signal. In the case of multi- plexing, the filter bank is arranged so that the first Q-1 filters of each cascade receive a complex value input signal and put out a complex value output signal and the output filter of each cascade receive a complex value input signal and put out a real value output signal.

566552

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