Title:
DIGITAL FILTER CIRCUIT, DIGITAL-FILTER APPLICATION METHOD, AND STORAGE MEDIUM CONTAINING DIGITAL-FILTER APPLICATION PROGRAM
Document Type and Number:
WIPO Patent Application WO/2013/125173
Kind Code:
A1
Abstract:
The present invention reduces the circuit size and power consumption required to apply a digital filter in the frequency domain. This digital filter circuit is provided with the following: a complex-conjugate generation unit that generates a second complex signal containing the complex conjugate of each complex number constituting a first complex signal in the frequency domain, said first complex signal having been generated by performing a Fourier transform on a time-domain complex signal; a filter-coefficient generation unit that generates complex first and second frequency-domain filter coefficients from inputted complex first, second, and third input filter coefficients; a first filter unit that uses the first frequency-domain filter coefficients to apply a filter to the first complex signal, yielding a third complex signal; a second filter unit that uses the second frequency-domain filter coefficients to apply a filter to the second complex signal, yielding a fourth complex signal; and a complex-conjugate combination unit that combines the third and fourth complex signals, yielding a fifth complex signal.
Inventors:
SHIBAYAMA ATSUFUMI (JP)
ABE JUNICHI (JP)
ABE JUNICHI (JP)
Application Number:
PCT/JP2013/000754
Publication Date:
August 29, 2013
Filing Date:
February 13, 2013
Export Citation:
Assignee:
NEC CORP (JP)
SHIBAYAMA ATSUFUMI (JP)
ABE JUNICHI (JP)
SHIBAYAMA ATSUFUMI (JP)
ABE JUNICHI (JP)
International Classes:
H03H17/02
Foreign References:
| JP2003115819A | 2003-04-18 | |||
| JP2005065231A | 2005-03-10 | |||
| JP2008017511A | 2008-01-24 | |||
| JP2011004264A | 2011-01-06 | |||
| JP2010219582A | 2010-09-30 |
Attorney, Agent or Firm:
SHIMOSAKA, NAOKI (JP)
Naoki Shimosaka (JP)
Naoki Shimosaka (JP)
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Claims: