Title:
電子会議におけるサブバンド音響エコーキャンセラのための適応フィルタタップ設定の最適化
Document Type and Number:
Japanese Patent JP3568665
Kind Code:
B2
Abstract:
A subband acoustic echo canceller for a telecommunications teleconferencing room is equiped with subband adaptive filters and filter taps associated with said subbands. A data store is provided containing a weight list for controlling allocation of the filter taps among the subbands. An optimum tap profile as determined by the weights is a composite of room acoustic impulse response and weighting adjustments based on one or more measures of perceived human acoustic sensitivity experienced by far-end users. An active periodic adjustment of the weights responsive to detection of sibilant energy in the incoming path further improves echo cancellation. Active measurement and updating of the room acoustic impulse response provides further refinement.
Inventors:
Eric John Dyzone
Application Number:
JP33454895A
Publication Date:
September 22, 2004
Filing Date:
December 22, 1995
Export Citation:
Assignee:
AT&T CORP.
International Classes:
H03H21/00; H03H17/02; H04B3/23; H04M3/56; H04M9/08; (IPC1-7): H04B3/23; H03H17/02; H03H21/00
Domestic Patent References:
| JP4123606A | ||||
| JP7074682A |
Attorney, Agent or Firm:
Masao Okabe
Yoshio Inoue
Nobuaki Kato
Yoshio Inoue
Nobuaki Kato