Dolby International Ab

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Reinhold Boehm

Daniel Homm

Heiko Purnhagen

Juergen Herre

Martin Dietz

Ralph Sperschneider

Michael Schug

Holger Hoerich

Martin Wolters

Leif Sehlstrom

Karsten Linzmeier

Alexander Stahlmann

Thomas Ziegler

Robin Thesing

Alexander Groeschel

Wolfgang Alexander Schildbach

Pierre Lauber

Simon Plain

Leif Sehlström

Mark C Leddy

Vinay Mathew

Oliver Watzke

Wolfgang A Schildbach

Mark Leddy

A technique including receiving and decoding a coded bitstream encoded with audio content including first audio objects corresponding to a first media content type of two consecutive media content types and second audio objects corresponding to a second media content type of the two consecutive media content types, and audio metadata corresponding to the audio content. The audio metadata including first and second audio object gains, for the first and second audio objects, generated in part based on a first fading curve of the first media content type and a second fading curve of the second media content type, respectively. The technique further includes applying the first and second audio object gains to the first and second audio objects, and rendering a sound field represented by the first audio object with the applied first audio object gain and the second audio object with the applied second audio object gain.

Using metadata to aggregate signal processing operations

The present document relates to techniques for authentication of data streams. Specifically, the present document relates to the insertion of identifiers into a data stream, such as a Dolby Pulse, AAC or HE AAC bitstream, and the authentication and verification of the data stream based on such identifiers. A method and system for encoding a data stream comprising a plurality of data frames is described. The method comprises the step of generating a cryptographic value of a number N of successive data frames and configuration information, wherein the configuration information comprises information for rendering the data stream. The method then inserts the cryptographic value into the data stream subsequent to the N successive data frames.

Authentication of data streams

In a method for concealing an error in an encoded audio signal a set of spectral coefficients is subdivided into at least two sub-bands (), whereupon the sub-bands are subjected to a re-verse transform (). A specific prediction is performed () for each quasi time signal of a sub-band to obtain an estimated temporal representation for a sub-band of a set of spectral coefficients following the current set. A forward transform () of the time signal of each sub-band provides estimated spectral coefficients which can be used () instead of erroneous spectral coefficients of a following set of spectral coefficients, e.g. in order to conceal transmission errors. Transforming at the sub-band level provides independence from transform characteristics such as block length, window type and MDCT algorithm while at the same time preserving spectral processing for error concealment. Thus the spectral characteristics of audio signals can also be taken into account during error concealment.

Method and device for error concealment in an encoded audio-signal and method and device for decoding an encoded audio signal

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Nuremberg, Germany

Reinhold Boehm