Title:
ADAPTIVE STEP SIZE CONTROL ADAPTIVE FILTER AND ADAPTIVE SCALE COEFFICIENT CONTROL METHOD
Document Type and Number:
Japanese Patent JP3804496
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an adaptive step size control adaptive filter and an adaptive scale coefficient control method for improving a residual mean square error when identifying the unknown system response of a non-ordinary change with time in the adaptive step size control adaptive filter using a stochastic gradient sign algorithm.
SOLUTION: In the adaptive filter having a non-cyclic filter and using the stochastic gradient sign algorithm, adaptive step size control is performed while defining a value provided by multiplying a scale coefficient to the absolute value of a signal updated by a leak accumulator for receiving the product of the polarity of the sum signal of an error signal and an additive noise and a signal delaying the sum signal for the time of one unit as a step size. In such a case, the scale coefficient is adaptively controlled as well by using a gradient related to the scale coefficient of the error signal.
Inventors:
Shinichi Koike
Application Number:
JP2001282390A
Publication Date:
August 02, 2006
Filing Date:
September 17, 2001
Export Citation:
Assignee:
NEC
International Classes:
H03H21/00; H04R3/02; H04B3/06; H04B3/23; (IPC1-7): H03H21/00; H04B3/06; H04B3/23; H04R3/02
Domestic Patent References:
| JP2000031791A | ||||
| JP11007305A | ||||
| JP11007306A | ||||
| JP11004141A |
Attorney, Agent or Firm:
Takao Maruyama