Title:
DIGITAL SIGNAL DEMULTIPLEXING DEVICE AND MULTIPLEXING DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/136010
Kind Code:
A1
Abstract:
Disclosed is a digital signal demultiplexing device for multi/demultiplexing reception
signals which have been frequency-multiplexed and outputting the signals.
The digital signal demultiplexing device includes: demultiplexing filter
bank means formed by connecting in multiple stages, unit demultiplexing filter
banks, each having at least one filter for filtering an input signal and a down
sampler for down-sampling an output signal of each filter and outputting the
signal; and frequency conversion/decimeter means for inputting the reception signal
and at least one of the output signals of the unit demultiplexing filter banks.
The frequency conversion/decimeter means includes: frequency conversion means
provided for each of input signals for shifting frequency of an input signal when
outputting it; and a decimeter connected in series to one or more outputs of the
frequency conversion means. The decimeter means has a filter for performing band
limit of the input signal and a down sampler for down-sampling the output signal
of the filter when outputting the signal.
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Inventors:
KOBAYASHI KIYOSHI (JP)
TANAKA HIROSHI (JP)
KAZAMA HIROSHI (JP)
TANAKA HIROSHI (JP)
KAZAMA HIROSHI (JP)
Application Number:
PCT/JP2007/060268
Publication Date:
November 29, 2007
Filing Date:
May 18, 2007
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
KOBAYASHI KIYOSHI (JP)
TANAKA HIROSHI (JP)
KAZAMA HIROSHI (JP)
KOBAYASHI KIYOSHI (JP)
TANAKA HIROSHI (JP)
KAZAMA HIROSHI (JP)
International Classes:
H03H17/02; H03H17/00; H04J1/02
Foreign References:
| JP2001111639A | 2001-04-20 | |||
| JPS636929A | 1988-01-12 | |||
| JPH0846654A | 1996-02-16 |
Attorney, Agent or Firm:
ITOH, Tadahiko et al. (Yebisu Garden Place Tower 20-3, Ebisu 4-chom, Shibuya-ku Tokyo 32, JP)
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