Title:
【発明の名称】オーディオ信号をコーディングする方法及び装置並びにビットストリームをデコーディングする方法及び装置
Document Type and Number:
Japanese Patent JP3366903
Kind Code:
B2
Abstract:
The present invention permits a combination of a scalable audio coder with the TNS technique. In a method for coding time signals sampled in a first sampling rate, second time signals are first generated whose sampling rate is smaller than the first sampling rate. The second time signals are then coded according to a first coding algorithm and written into a bit stream. The coded second time signals are, however, decoded again, and, like the first time signals, transformed into the frequency domain. From a spectral representation of the first time signals, TNS prediction coefficients are calculated. The transformed output signal of the coder/decoder with the first coding algorithm, like the spectral representation of the first time signal, undergoes a prediction over the frequency to obtain residual spectral values for both signals, though only the prediction coefficients calculated on the basis of the first time signals are used. These two signals are evaluated against each other. The evaluated residual spectral values are then coded by means of a second coding algorithm to obtain coded evaluated residual spectral values, which, together with the side information containing the calculated prediction coefficients, are written into the bit stream.
Inventors:
Grill bernhard
Herre Jürgen
Taihiman Bodo
Brandenburg Karl Heinz
Gerhauser Heinz
Herre Jürgen
Taihiman Bodo
Brandenburg Karl Heinz
Gerhauser Heinz
Application Number:
JP2000518448A
Publication Date:
January 14, 2003
Filing Date:
July 07, 1998
Export Citation:
Assignee:
Fraunhofer-Gesellschaft Tourfoldung der Angewanten Forschung A Fau
International Classes:
G10L19/02; H03H17/00; H03M7/00; G10L19/00; H03M7/30; H04B1/66; H04B14/04; (IPC1-7): H03M7/30; G10L19/00; G10L19/02
Domestic Patent References:
| JP8330973A | ||||
| JP3144700A | ||||
| JP669810A |
Attorney, Agent or Firm:
Michihiro Okada