Title:
デジタル適応フィルタと同フィルタを用いたアコスティックエコーキャンセラ
Document Type and Number:
Japanese Patent JP4424851
Kind Code:
B2
Abstract:
To achieve an improved convergence behaviour for, e.g., echo cancellation there is provided a digital adaptive filter which includes a filter coefficient update means to successively update filter coefficients in accordance with an input signal, an estimated power of the input signal, and an error signal between the input signal filtered in the digital adaptive filter and the input signal propagated along an external path being modelled by the digital adaptive filter. Here, an input signal power estimation means is adapted to perform recursive smoothing for an increasing input power and a decreasing input power in an asymmetric fashion with different smoothing factors. In case the estimation is carried out in the frequency domain the step size for the update of filter coefficients may be calculated for each frequency band individually.
Inventors:
Arun Brewster, Werner
Application Number:
JP2000560710A
Publication Date:
March 03, 2010
Filing Date:
July 01, 1999
Export Citation:
Assignee:
Telefon Akti Bora Get Elm Ericson (Pubble)
International Classes:
H03H21/00; H04B3/23; H04M9/08
Domestic Patent References:
| JP7202765A | ||||
| JP8130495A |
Attorney, Agent or Firm:
Sonoda Yoshitaka
Kobayashi Yoshinori
Kobayashi Yoshinori