Apparatus for providing an upmix signal representation on the basis of the downmix signal representation, apparatus for providing a bitstream representing a multi-channel audio signal, methods, computer programs and bitstream representing a multi-channel audio signal using a linear combination parameter

US8571877B2 · kind B2 · utility

Assignees

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE
• Dolby International AB · IE

Inventors

• Jonas Engdegard · Stockholm, SE
• Heiko Purnhagen · Sundbyberg, SE
• Juergen Herre · Erlangen, DE
• Cornelia Falch · Rum, AT
• Oliver Hellmuth · Erlangen, DE
• Leon Terentiv · Erlangen, DE

Key dates

• Filing date: May 18, 2012
• Grant date: Oct 29, 2013
• Expiry date: May 18, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/008
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for providing an upmix signal representation on the basis of a downmix signal representation and an object-related parametric information, which are included in a bitstream representation of an audio content, in independence on a user-specified rendering matrix, the apparatus has a distortion limiter configured to obtain a modified rendering matrix using a linear combination of a user-specified rendering matrix in a target rendering matrix in dependence on a linear combination parameter. The apparatus also has a signal processor configured to obtain the upmix signal representation on the basis of the downmix signal representation and the object-related parametric information using the modified rendering matrix. The apparatus is also configured to evaluate a bitstream element representing the linear combination parameter in order to obtain the linear combination parameter.