Title:
ADAPTIVE FILTER DEVICE AND ADAPTIVE PROCESSING METHOD
Document Type and Number:
Japanese Patent JP2015070471
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an adaptive signal processing technology capable of tracking environmental variance.SOLUTION: A Kalman gain update part 42 updates Kalman gain based on autocorrelation of input data. A filter coefficient update part 46 updates a filter coefficient based on updated Kalman gain. A first correlation part 32 obtains an autocorrelation value for a predetermined first period for the input data. A second correlation part 34 obtains an autocorrelation value for a second period longer than the first period for the input data. A comparing part 40 obtains a comparison result by comparing an autocorrelation value for the second period and an autocorrelation value for the first period. The Kalman gain update part 42 updates Kalman gain while decreasing effect of past autocorrelation if the comparison result is greater than a predetermined threshold value.
Inventors:
NAITO JOJI
Application Number:
JP2013203357A
Publication Date:
April 13, 2015
Filing Date:
September 30, 2013
Export Citation:
Assignee:
JVC KENWOOD CORP
International Classes:
H04B3/06; H03H21/00
Attorney, Agent or Firm:
Sakaki Morishita