Title:
適応デュアルフィルタエコーキャンセル方法
Document Type and Number:
Japanese Patent JP4026693
Kind Code:
B2
Abstract:
In a dual filter echo cancellation method, a new quality measure provides the basis for a new filter selection and transfer method. The quality measure represents the performance of a filter in the adaptive echo canceller. According to the method, a correlation measure between an echo containing signal and an echo estimation signal produced by the filter is estimated. A power measure of a residual signal, formed by the difference between the echo estimation signal and the echo containing signal, is estimated. The quality measure is calculated by dividing the estimated correlation measure by the estimated power measure. An adaptive filter and a programmable filter are used in the echo cancellation and the quality measures for both are calculated and compared. The best of the two filters, as determined by the quality measure, is used for modeling the echo path, and its filter coefficients are copied to the other filter.
Inventors:
Junko Komoda
Ericsson, Andels
Ericsson, Andels
Application Number:
JP51575197A
Publication Date:
December 26, 2007
Filing Date:
October 16, 1996
Export Citation:
Assignee:
Telefon Acty Boraget Elm Ericson (Pubble)
International Classes:
H03H21/00; H04Q3/42; H04B3/23
Domestic Patent References:
| JP1318325A | ||||
| JP62291223A |
Attorney, Agent or Firm:
Miaki Kametani
Tetsuo Kanamoto
Koji Hagiwara
Hideto Asamura
Hajime Asamura
Kuniaki Shimizu
Hayashi Zouzo
Tetsuo Kanamoto
Koji Hagiwara
Hideto Asamura
Hajime Asamura
Kuniaki Shimizu
Hayashi Zouzo