Title:
DIGITAL FILTER, ACOUSTIC DEVICE, AND FILTER CHARACTERISTIC MODIFICATION METHOD
Document Type and Number:
Japanese Patent JP2014204220
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a digital filter that can suppress the amount of generation of a discontinuous change in a filtering result when a filter characteristic is modified by switching a coefficient vector.SOLUTION: Coefficients K-Kcorresponding to an input digital signal X(T) and output digital signals X(T)-X(T) from a shift register section 210 having a plurality of delay output sections 211-211arranged in series and receiving the input digital signal X(T) input into the initial stage delay output section 211, respectively, are switched. For such switching, a coefficient switching section 240 detects that a signal level indicated by the input digital signal X(T) is equal to or less than a predetermined value. If the signal level indicated by the input digital signal X(T) is detected being equal to or less than the predetermined value, a coefficient component by which to multiply a signal level equal to or less than the predetermined value is sequentially switched per sampling time.
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Inventors:
AOKI TAKESHI
HAGIWARA TAKUYA
HAYASHI MAKOTO
KOGA YUICHIRO
HAGIWARA TAKUYA
HAYASHI MAKOTO
KOGA YUICHIRO
Application Number:
JP2013077508A
Publication Date:
October 27, 2014
Filing Date:
April 03, 2013
Export Citation:
Assignee:
PIONEER ELECTRONIC CORP
International Classes:
H03H17/02; G10L21/0316; H03H17/06
Attorney, Agent or Firm:
Shibata Itsuo
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