Title:
オーディオエンコーダ、オーディオデコーダ、及び複素数予測を使用したマルチチャンネルオーディオ信号処理方法
Document Type and Number:
Japanese Patent JP2013528822
Kind Code:
A
Abstract:
An audio encoder and an audio decoder are based on a combination of two audio channels (201, 202) to obtain a first combination signal (204) as a mid signal and a residual signal (205) which can be derived using a predicted side signal derived from the mid signal. The first combination signal and the prediction residual signal are encoded (209) and written (212) into a data stream (213) together with the prediction information (206) derived by an optimizer (207) based on an optimization target (208). A decoder uses the prediction residual signal, the first combination signal and the prediction information to derive a decoded first channel signal and a decoded second channel signal. In an encoder example or in a decoder example, a real-to-imaginary transform can be applied for estimating the imaginary part of the spectrum of the first combination signal. For calculating the prediction signal used in the derivation of the prediction residual signal, the real-valued first combination signal is multiplied by a real portion of the complex prediction information and the estimated imaginary part of the first combination signal is multiplied by an imaginary portion of the complex prediction information.
Inventors:
Prunhagen, Heiko
Carlson, Pontus
Willemoes, Lars
Robillard, Julian
Neusinger, Matthias
Helmrich, Christian
Hilpert, Johannes
Lettleback, Nicolaus
Dish, sasha
Edler, Burnt
Carlson, Pontus
Willemoes, Lars
Robillard, Julian
Neusinger, Matthias
Helmrich, Christian
Hilpert, Johannes
Lettleback, Nicolaus
Dish, sasha
Edler, Burnt
Application Number:
JP2013503057A
Publication Date:
July 11, 2013
Filing Date:
March 23, 2011
Export Citation:
Assignee:
Fraunhofer-Gesellschaft Tool Felderung del Angewanten Forsung Eingetler Genel Fehlein
International Classes:
G10L19/008; G10L19/02; G10L19/04; H03M7/30
Domestic Patent References:
| JP2011522472A | 2011-07-28 | |||
| JP2008516275A | 2008-05-15 | |||
| JPH04506141A | 1992-10-22 | |||
| JP2002538644A | 2002-11-12 | |||
| JP2008518257A | 2008-05-29 | |||
| JP2011527446A | 2011-10-27 |
Foreign References:
| WO2009141775A1 | 2009-11-26 | |||
| WO2010003532A1 | 2010-01-14 |
Other References:
HEIKO PURNHAGEN, ET AL.: ""Technical description of proposed Unified Stereo Coding in USAC"", ISO/IEC JTC1/SC29/WG11, vol. MPEG2009/M16921, JPN5013006196, October 2009 (2009-10-01), pages 1 - 14, ISSN: 0002998047
MAX NEUENDORF: ""WD5 of USAC"", ISO/IEC JTC1/SC29/WG11, vol. MPEG2009/N11040, JPN5013006197, October 2009 (2009-10-01), pages 1 - 146, ISSN: 0002998048
MAX NEUENDORF: ""WD5 of USAC"", ISO/IEC JTC1/SC29/WG11, vol. MPEG2009/N11040, JPN5013006197, October 2009 (2009-10-01), pages 1 - 146, ISSN: 0002998048
Attorney, Agent or Firm:
Patent business corporation Profic patent office