Audio decoding of multi-audio-object signal using upmixing

US8155971B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Oliver Hellmuth · Erlangen, DE
• Johannes Hilpert · Nuremberg, DE
• Leonid Terentiev · Erlangen, DE
• Cornelia Falch · Rum, AT
• Andreas Hoelzer · Erlangen, DE
• Juergen Herre · Erlangen, DE

Key dates

• Filing date: Oct 17, 2008
• Grant date: Apr 10, 2012
• Expiry date: Aug 22, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S2420/07
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A method for decoding a multi-audio-object signal having audio signals of first and second types encoded therein, the multi-audio-object signal having a downmix signal and side information having level information of the audio signals of the first and second types in a first predetermined time/frequency resolution, the method including computing a prediction coefficient matrix C based on the level information; and up-mixing the downmix signal based on the prediction coefficients to obtain a first and/or a second up-mix audio signal approximating the audio signals of the first and second types, respectively, wherein up-mixing yields the first and/or second up-mix signals S1 and S2 from the downmix signal d according to a computation representable bywith “1” denoting—depending on the number of channels of d—a scalar, or an identity matrix, and D−1 being a matrix uniquely determined by a downmix prescription according to which the audio signals of the first and second types are downmixed into the downmix signal, and which is also included by the side information, and H being a term independent from d.