Filter bank for frequency demultiplexing in multiple channels

Details Filter bank for frequency demultiplexing in multiple channels Filter bank for frequency demultiplexing in multiple channels

1988-05-13

1990-01-23

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3647241, 36472413, 36472416, H04J 108

Patent

active

048963208

ABSTRACT:
A filter bank for frequency demultiplexing or multiplexing, respectively, of L channel signals. The filter bank is composed of L transversal filters (non-recursive filters, that is filters having an impulse response of finite duration having complex 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 F.sub.1, . . . F.sub.q, . . . F.sub.Q, the sampling rate is reduced or increased, respectively, by a factor of M.sub.1 >1 and ##EQU1## 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 multiplexing, 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.

REFERENCES:
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patent: 4578790 (1986-03-01), Molo et al.
patent: 4706239 (1987-11-01), Ito et al.
Del Rio, Enrico and Emiliani, P. L., "An Analytic Signal Approach for Transmultiplexers: Theory and Design," IEEE Transactions on Communications, vol. COM-30, No. 7, Jul. 1982, p. 1623-1628.
Crochiere, R. E. and Rabiner, L. R., Multirate Digital Processing, Chs. 5 & 6, pp. 193-269.
Bellanger, M. G., Daguet, J. L. and Lepagnol, G. P., "Inter-Extrapolation, and Reduction of Computation Speed in Digital Filters," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-22, No. 4, Aug. 1974, pp. 231-235.

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