Multiplex communications – Wide area network – Packet switching
Patent
1987-03-24
1988-12-20
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 50, H04J 102
Patent
active
047929430
ABSTRACT:
A circuit including a digital filter bank for effecting conversion between a frequency multiplex signal having a sampling rate f.sub.A and L product sums corresponding to the sampled values of the frequency multiplex signal, the pulse response of the filter bank being of finite length, and a discrete Fourier transformation device for effecting conversion between the product sums and L individual complex signals. The sampling rate is reduced by the factor M.ltoreq.L in the transformation device so that only every M.sup.th value of the product sums is processed therein. In the filter bank, the frequency multiplex signal is a complex signal; the real portion and the imaginary portion of this signal are delayed in respective delay member chains associated with partial sequences of individual signal values which are sampled at a rate of f.sub.A /M. These signal values for the real portion and for the imaginary portion are each multiplied by the coefficients of the pulse response and the latter are each multiplied by complex coefficients and the respective i.sup.th complex signals are summed to form the L product sums.
REFERENCES:
patent: 4237551 (1980-12-01), Narasimha
patent: 4241443 (1980-12-01), Sakaki et al.
patent: 4393456 (1983-07-01), Marshall, Jr.
ANT Nachrichtentechnik GmbH
Chin Wellington
Olms Douglas W.
LandOfFree
Digital filter bank does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital filter bank, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital filter bank will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1913431