Title:
【発明の名称】フィルタリング装置
Document Type and Number:
Japanese Patent JP2003505967
Kind Code:
A
Abstract:
The invention relates, in the field of subband decomposition, to the design of filter banks adapted to the input signal statistics. In most cases, two channel filter banks are iteratively applied over several levels of decomposition, the signals in the resulting subbands representing decimated and filtered versions of the input signal. According to the invention, it is proposed a perfect reconstruction critically decimated polyphase filter bank with a ladder structure, which adapts to the nonstationarities in the input signal. In the simplest embodiment, four steps are provided in the implementation of the filtering method: a splitting step (21), provided for subdividing the input signal c0(n) into two disjoint subsets c0(2n) and c0(2n+1) of samples (odd and even ones), a predicting step (22), provided for predicting on the basis of the even subset the odd one (d1(n)=c0(2n+1)-P1[c0(2n)], an updating step (23), provided for generating on the basis of said predicted odd subset the even one (c1(n)=c0(2n)+U1[d1(n)], and an iterative cross-optimization step associating said updating step (23) of the current decomposition level and the predicting step (32) of the following one. More generally, several successive similar scales may be provided, a minimization of the variance of the obtained coefficients being used as an optimization criterion at each scale.
Inventors:
Pesque-Popescue, Beatrice
Application Number:
JP2001512705A
Publication Date:
February 12, 2003
Filing Date:
July 21, 2000
Export Citation:
Assignee:
Konin Krekka Philips Electronics NV
International Classes:
G06F17/10; H03H17/02; H03H17/06; H03H21/00; H04N7/30; (IPC1-7): H03H17/06; G06F17/10; H04N7/30
Attorney, Agent or Firm:
Tadahiko Ito