Title:
DIGITAL FILTER
Document Type and Number:
WIPO Patent Application WO/2016/021382
Kind Code:
A1
Abstract:
A digital filter is provided with: integration calculation units (10) in which the data of M channels is subjected to time-division multiplexing, said units (10) being cascade-connected using, as an input, time-division-multiplexed data obtained by updating the data of each channel at the rate of a sampling frequency fS, the integration calculation units (10) operating according to a clock having a frequency fS × M, and the time-division-multiplexed data being integrated for each M sample; a frequency conversion unit (11) operated according to a clock having a frequency fD × M, the data of sampling frequency fS inputted from the final-stage integration calculation unit (10) being culled at a sampling frequency fD, and the culled data being given an (M-1) sample delay; and differential calculation units (12) operated according to a clock having a frequency fD × M, said units (12) being cascade-connected to the output of the frequency conversion unit (11), and data that has not yet been M-sampled being subtracted from the input data by each of the differential calculation units (12).
Inventors:
KAJITA TETSUYA (JP)
Application Number:
PCT/JP2015/070238
Publication Date:
February 11, 2016
Filing Date:
July 15, 2015
Export Citation:
Assignee:
AZBIL CORP (JP)
International Classes:
H03H17/02; H03H17/00; H03M3/02; H04J3/00
Foreign References:
| JPH06209266A | 1994-07-26 | |||
| JPS62281507A | 1987-12-07 | |||
| US4872129A | 1989-10-03 | |||
| US5590065A | 1996-12-31 |
Attorney, Agent or Firm:
YAMAKAWA, Masaki et al. (JP)
Masaki Yamakawa (JP)
Masaki Yamakawa (JP)
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