Title:
前白色化を伴うLMSアルゴリズムによって適応させられる適応フィルタの更新済みフィルタ係数を決定する方法
Document Type and Number:
Japanese Patent JP5284475
Kind Code:
B2
Abstract:
The application relates to a method for determining at least one updated filter coefficient of an adaptive filter (22) adapted by an LMS algorithm. According to the method, filter coefficients of a first whitening filter (25') are determined, in particular filter coefficients of an LPC whitening filter. The first whitening filter (25') generates a filtered signal. A normalization value is determined based on one or more computed values obtained in the course of determining the filter coefficients of the first whitening filter (25'). The normalization value is associated with the energy of the filtered signal. At least one updated filter coefficient of the adaptive filter (22) is determined in dependency on the filtered signal and the normalization value. Preferably, updated filter coefficients for all filter coefficients of the adaptive filter (22) are determined.
Inventors:
Anderson, Robert El
Davidson, Grant A
Davidson, Grant A
Application Number:
JP2011525117A
Publication Date:
September 11, 2013
Filing Date:
August 24, 2009
Export Citation:
Assignee:
Dolby Laboratories Licensing Corporation
International Classes:
H03H21/00
Domestic Patent References:
| JP5216485A | ||||
| JP2002501337A |
Other References:
Gordy, J.D.; Goubran, R.A.,A combined LPC-based speech coder and filtered-X LMS algorithm for acoustic echo cancellation ,Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on ,IEEE,2004年,Volume: 4 ,IV125-IV128
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito
Yuzo Yamazaki
Naoto Sugiyama
Shirogane Expo
Toshiaki Akamatsu
Ono Wataru
Okuko Masako
Tadao Naito
Katsuaki Tsunemitsu
Asako Ando
Takeko Miko
Chihiro Imai
Shinsuke Onuki
Tadashige Ito
Yuzo Yamazaki
Naoto Sugiyama
Shirogane Expo
Toshiaki Akamatsu
Ono Wataru
Okuko Masako
Tadao Naito
Katsuaki Tsunemitsu
Asako Ando
Takeko Miko
Chihiro Imai