发明公开
- 专利标题: VERFAHREN UND VORRICHTUNG ZUM ERFASSEN EINES ANSCHLAGS IN EINEM ZEITDISKRETEN AUDIOSIGNAL
- 专利标题(英): Method and device for detecting a transient in a discrete-time audiosignal, and device and method for coding an audiosignal
- 专利标题(中): 方法和装置用于记录攻击在时间离散音频信号
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申请号: EP98937484.8申请日: 1998-06-15
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公开(公告)号: EP1005695A2公开(公告)日: 2000-06-07
- 发明人: HILPERT, Johannes , HERRE, Jürgen , GRILL, Bernhard , BUCHTA, Rainer , BRANDENBURG, Karlheinz , GERHÄUSER, Heinz
- 申请人: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DERANGEWANDTEN FORSCHUNG E.V.
- 申请人地址: Leonrodstrasse 54 80636 München DE
- 专利权人: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DERANGEWANDTEN FORSCHUNG E.V.
- 当前专利权人: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DERANGEWANDTEN FORSCHUNG E.V.
- 当前专利权人地址: Leonrodstrasse 54 80636 München DE
- 代理机构: Schoppe, Fritz, Dipl.-Ing.
- 优先权: DE19736669 19970822
- 国际公布: WO9910886 19990304
- 主分类号: G11B20/00
- IPC分类号: G11B20/00
摘要:
The invention relates to a method for detecting a transient in a discrete-time audiosignal (x(k)) which is carried out entirely in the time domain. Said method comprises a step in which the discrete-time audiosignal is segmented so as generate consecutive segments of identical length with unfiltered discrete-time audiosignals (xs(T), xs(T-1), xs(T-2), ...), after which the discrete-time audiosignal (xs(T)) in a current segment is filtered. Thereafter there are two options: either the energy (Ef(T)) of the filtered discrete-time audiosignal (Ys(T)) in the current segment can be compared with the energy (Ef(T-1)) of the filtered discrete-time audiosignal (Ys(T-1)) in a preceding segment, or a current relationship can be generated between the energy (Ef(T)) of the filtered discrete-time audiosignal (Ys(T)) in the current segment and the energy (Eu(T)) of the unfiltered discrete-time audiosignal (Xs(T)) in the current segment and said current relationship compared with a corresponding preceding relationship. On the basis of the one comparison and/or the other comparison it is determined whether a transient is present in the discrete-time audiosignal.
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