Title:
効率的なサブバンド適応ＦＩＲフィルタリング
Document Type and Number:
Japanese Patent JP5715595
Kind Code:
B2
Abstract:
An audio system with at least one audio channel is disclosed. The audio system includes a digital audio processor in which at least one digital filter is implemented for each channel. The digital filter of each channel comprises: an analysis filter bank (22) configured to receive a broad-band input audio signal and divide the input audio signal into a plurality of sub-bands thus providing sub-band signals having equal bandwidths, the spectra of the sub-band signals composing the spectrum of the input audio signal; a sub-band FIR filter (G 1 ,G 2 ,G 3 ...) for each sub-band, thus providing respective filtered sub-band signals; and a synthesis filter bank (22') configured to receive the filtered sub-band signals and to combine them for providing a broad-band output audio signal, wherein a delay ( 1 , 2 , 3 ,...) is associated with each sub-band signal, the delay ( 1 ) of one of the sub-band signals being applied to the broad-band input audio signal upstream of the analysis filter bank and the residual delays ( 2 - 1 , 3 - 1 ) being applied to the remaining sub-band signals downstream of the analysis filter bank.
Inventors:
Marx Christoph
Application Number:
JP2012121895A
Publication Date:
May 07, 2015
Filing Date:
May 29, 2012
Export Citation:
Assignee:
Herman Becker Automotive Systems GM Behr
International Classes:
H03H17/06; G10L25/18; H03H17/02; H03H17/08; H03H21/00
Domestic Patent References:
| JP8079137A | ||||
| JP11355182A |
Attorney, Agent or Firm:
Hidesaku Yamamoto
Takaaki Yasumura
Natsuki Morishita
Takaaki Yasumura
Natsuki Morishita
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