Title:
複素変調フィルタバンクを用いた効率的なフィルタリング
Document Type and Number:
Japanese Patent JP5452936
Kind Code:
B2
Abstract:
A filter converter (104) for converting an impulse response signal indicative of an amplitude/frequency filter characteristic in a time domain into filter definition signal, the converter comprising a complex modulated filter bank (301) for filtering the impulse response signal to obtain a plurality of complex valued subband signals forming the filter definition signal, wherein each complex valued subband signal corresponds to an impulse response for a subband filter (102). At least one complex subband signal comprises at least two different non-vanishing values and each complex valued subband signal is shorter than the impulse response signal. The impulse response signal is a time domain FIR (Finite Impulse Response) filter. The complex modulated filter bank (301) is adapted to output L complex valued subband signals and the complex modulated filter bank (301) is adapted for providing the L complex valued subband signals downsampled by a factor L.
Inventors:
Willemoes Lars
Application Number:
JP2008551652A
Publication Date:
March 26, 2014
Filing Date:
September 01, 2006
Export Citation:
Assignee:
DOLBY INTERNATIONAL AB
International Classes:
H03H17/06; H03H17/02
Domestic Patent References:
| JP2004533155A | ||||
| JP2005148274A |
Foreign References:
| US5327366 | ||||
| WO2004097794A1 |
Attorney, Agent or Firm:
Masahiro Okada