Digital signal demultiplexing device and multiplexing device

Details Digital signal demultiplexing device and multiplexing device Digital signal demultiplexing device and multiplexing device

2011-05-03

2011-05-03

Rao, Seema S (Department: 2462)

Multiplex communications

Communication over free space

Combining or distributing information via frequency channels

C370S497000, C375S285000, C375S350000

Reexamination Certificate

active

07936742

ABSTRACT:
A frequency digital signal demultiplexing apparatus including: demultiplexing filter bank units connected in a multistage manner to form a demultiplexing filter bank, wherein each unit includes at least one filter for filtering an input signal in series with a down-sampler, and frequency conversion and decimator part to receive at least one of the received signal and output signals of each unit demultiplexing filter bank, which includes a frequency conversion part, for each input signal, to shift a frequency of an input signal, and at least one decimator part serially connected to an output of each frequency conversion part, the decimator part including a filter for performing band limitation of an input signal and a down-sampler for down-sampling an output signal of the filter and output a down-sampled signal.

REFERENCES:
patent: 6714529 (2004-03-01), Tanabe et al.
patent: 2002/0156820 (2002-10-01), Kishi
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patent: 2001 111639 (2001-04-01), None
patent: 3299952 (2002-04-01), None
U.S. Appl. No. 12/441,981, filed Mar. 19, 2009, Kobayashi, et al.

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