Title:
【発明の名称】サブバンドエコーキャンセラ
Document Type and Number:
Japanese Patent JP3356369
Kind Code:
B2
Abstract:
Failure to cancel echos at frequencies in which the frequency characteristics of sub-band filters in the X and Y analysis filter banks (103,105) overlap in subband echo cancelers is overcome by employing an X-analysis filter bank (103) in which the pass-band of the subband filters is wider than the pass-band of the corresponding subband filters in the Y-analysis filter bank (105). This insures that there is sufficient energy in the tap delay lines of the adaptive filters (108-0---108 M-1) in the subband echo cancelers (107-0---107 M-1) at all frequencies where echos are to be synthesized. More specifically, the keeping of sufficient energy in the tap delay lines of the adaptive filters in the subband echo cancelers avoids exciting eigenmodes associated with the small eigenvalues of the correlation matrix.
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Inventors:
Donald Lars Dattweiler
Application Number:
JP6196A
Publication Date:
December 16, 2002
Filing Date:
January 04, 1996
Export Citation:
Assignee:
AT&T CORP.
International Classes:
G10L19/02; G10L21/0232; H03H17/02; H03H21/00; H04B3/21; H04B3/23; (IPC1-7): H04B3/23; H03H17/02; H03H21/00; H04B3/21
Domestic Patent References:
| JP8213940A | ||||
| JP6318885A | ||||
| JP4123606A |
Attorney, Agent or Firm:
Hirofumi Mitsumata