Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Koninklijke Philips Corporation N.V.

Dolby International Ab

Other

Coding Technologies Ab

Koninklijke Philips Electronics N.v.

Matthias Neusinger

Sascha Disch

Johannes Hilpert

Guillaume Fuchs

Julien Robilliard

Martin Dietz

Nikolaus Rettelbach

Benjamin Schubert

Markus Multrus

Christian Helmrich

Emmanuel Ravelli

Konstantin Schmidt

Markus Schnell

Andreas Niedermeier

Bernd Edler

Bernhard Grill

Ralf Geiger

Christian Neukam

Stephan Wilde

Sascha Dick

Wolfgang Fiesel

Manuel Jander

Florian Schuh

Richard Fueg

Tobias Schwegler

Juergen Herre

Goran Markovic

Heiko Purnhagen

Dirk Jeroen Breebaart

Stefan Doehla

Stephan Schreiner

Gerard Herman Hotho

Sebastian Scharrer

Oliver Hellmuth

Jonas Engdegard

Ralph Sperschneider

Jeroen Dirk Breebaart

Joerg Pickel

Erik Schuijers

Werner Oomen

Julien Robillard

Jeroen Breebaart

Lars Villemoes

Kristofer Kjoerling

Frederik Nagel

Achim Kuntz

Jürgen Herre

Harald Popp

Pontus Carlsson

Kristofer Kjörling

Holger Hoerich

Oliver Wuebbolt

Michael Schug

Christian Ertel

Markus Lohwasser

Bernhard Neugebauer

Arne Borsum

Oliver Wübbolt

Jörg Pickel

Stephan Geyersberger

Maria Luis-Valero

Gerard Hotho

Richard FÜG

Gerard c/o Koninklijke Philips Electronics NV Hotho

Jeroen c/o Koninklijke Philips Electronics NV Breebaart

W Koninklijke Philips Electronic NV Oomen

E Koninklijke Philips Electronic NV Schuijers

J Koninklijke Philips Electronic NV Breebaart

An apparatus for encoding a multi-channel signal having at least three channels includes an iteration processor, a channel encoder and an output interface. The iteration processor is configured to calculate inter-channel correlation values between each pair of the at least three channels, for selecting a pair including a highest value or including a value above a threshold, and for processing the selected pair using a multi-channel processing operation to derive first multi-channel parameters for the selected pair and to derive first processed channels. The iteration processor is configured to perform the calculating, the selecting and the processing using at least one of the processed channels to derive second multi-channel parameters and second processed channels. The channel encoder is configured to encode channels resulting from an iteration processing to obtain encoded channels. The output interface is configured to generate an encoded multi-channel signal including the encoded channels and the first and second multi-channel parameters.

Apparatus and method for encoding or decoding a multi-channel signal

An apparatus for upmixing a downmix audio signal describing one or more downmix audio channels into an upmixed audio signal describing a plurality of upmixed audio channels includes an upmixer and a parameter determinator. The upmixer is configured to apply temporally variable upmix parameters to upmix the downmix audio signal in order to obtain the upmixed audio signal, wherein the temporally variable upmix parameters include temporally variable smoothened phase values. The parameter determinator is configured to obtain one or more temporally smoothened upmix parameters for usage by the upmixer on the basis of a quantized upmix parameter input information. The parameter determinator is configured to combine a scaled version of a previous smoothened phase value with a scaled version of an input phase information using a phase change limitation algorithm, to determine a current smoothened phase value on the basis of the previous smoothened phase value and the phase input information.

Apparatus, method and computer program for upmixing a downmix audio signal using a phase value smoothing

An apparatus for generating an enhanced signal from an input signal, wherein the enhanced signal has spectral values for an enhancement spectral region, the spectral values for the enhancement spectral regions not being contained in the input signal, includes a mapper for mapping a source spectral region of the input signal to a target region in the enhancement spectral region, the source spectral region including a noise-filling region; and a noise filler configured for generating first noise values for the noise-filling region in the source spectral region of the input signal and for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from the first noise values or for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from first noise values in the source region.

Apparatus and method for generating an enhanced signal using independent noise-filling identified by an identification vector

An apparatus for processing an audio signal having associated therewith a pitch lag information and a gain information, includes a domain converter for converting a first domain representation of the audio signal into a second domain representation of the audio signal; and a harmonic post-filter for filtering the second domain representation of the audio signal, wherein the post-filter is based on a transfer function including a numerator and a denominator, wherein the numerator includes a gain value indicated by the gain information, and wherein the denominator includes an integer part of a pitch lag indicated by the pitch lag information and a multi-tap filter depending on a fractional part of the pitch lag.

Apparatus and method for processing an audio signal using a harmonic post-filter

An audio encoder for encoding an audio signal has: a first encoding processor for encoding a first audio signal portion in a frequency domain, having: a time frequency converter for converting the first audio signal portion into a frequency domain representation; an analyzer for analyzing the frequency domain representation to determine first spectral portions to be encoded with a first spectral resolution and second regions to be encoded with a second resolution; and a spectral encoder for encoding the first spectral portions with the first spectral resolution and encoding the second portions with the second resolution; a second encoding processor for encoding a second different audio signal portion in the time domain; a controller for analyzing and determining, which portion of the audio signal is the first audio signal portion encoded in the frequency domain and which portion is the second audio signal portion encoded in the time domain; and an encoded signal former for forming an encoded audio signal having a first encoded signal portion for the first audio signal portion and a second encoded signal portion for the second portion.

Audio encoder and decoder using a frequency domain processor with full-band gap filling and a time domain processor

An audio encoder for encoding an audio signal includes: a first encoding processor for encoding a first audio signal portion in a frequency domain, wherein the first encoding processor includes: a time frequency converter for converting the first audio signal portion into a frequency domain representation having spectral lines up to a maximum frequency of the first audio signal portion; a spectral encoder for encoding the frequency domain representation; a second encoding processor for encoding a second different audio signal portion in the time domain; a cross-processor for calculating, from the encoded spectral representation of the first audio signal portion, initialization data of the second encoding processor, so that the second encoding processing is initialized to encode the second audio signal portion immediately following the first audio signal portion in time in the audio signal; a controller configured for analyzing the audio signal and for determining, which portion of the audio signal is the first audio signal portion encoded in the frequency domain and which portion of the audio signal is the second audio signal portion encoded in the time domain; and an encoded signal former for forming an encoded audio signal including a first encoded signal portion for the first audio signal portion and a second encoded signal portion for the second audio signal portion.

Audio encoder and decoder using a frequency domain processor, a time domain processor, and a cross processing for continuous initialization

Apparatus and method for generating an enhanced signal using independent noise-filling at random values and scaling thereupon

An encoder/decoder is based on a combination of two audio or video channels to obtain a first combination signal as a mid-signal and a residual signal derivable using a predicted side signal derived from the mid-signal. A decoder uses the prediction residual signal, the first combination signal, a prediction direction indicator and prediction information to derive decoded first channel and second channel signals. A real-to-imaginary transform can be applied for estimating the imaginary part of the spectrum of the first combination signal. 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.

Audio or video encoder, audio or video decoder and related methods for processing multi-channel audio or video signals using a variable prediction direction

Apparatus and method for generating an enhanced signal using independent noise-filling

A processor for processing an audio signal has: an analyzer for deriving a window control signal from the audio signal indicating a change from a first asymmetric window to a second window, or indicating a change from a third window to a fourth asymmetric window, wherein the second window is shorter than the first window, or wherein the third window is shorter than the fourth window; a window constructor for constructing the second window using a first overlap portion of the first asymmetric window, wherein the window constructor is configured to determine a first overlap portion of the second window using a truncated first overlap portion of the first asymmetric window, or wherein the window constructor is configured to calculate a second overlap portion of the third window using a truncated second overlap portion of the fourth asymmetric window; and a windower for applying the first and second windows or the third and fourth windows to obtain windowed audio signal portions.

Processor and method for processing an audio signal using truncated analysis or synthesis window overlap portions

An apparatus for converting an object position of an audio object from a Cartesian representation to a spherical representation is described. A basis area of the Cartesian representation is subdivided into a plurality of basis area triangles, and wherein a plurality of spherical-domain triangles are inscribed into a circle of a spherical representation. The apparatus is configured to determine, in which of the basis area triangles a projection of the object position of the audio object into the base area is arranged; and the apparatus is configured to determine a mapped position of the projection of the object position using a linear transform, which maps the base area triangle onto its associated spherical domain triangle. The apparatus is configured to derive an azimuth angle and an intermediate radius value from the mapped position. The apparatus is configured to obtain a spherical domain radius value and an elevation angle in dependence on the intermediate radius value and in dependence on a distance of the object position from the base area. An apparatus for converting an object position of an audio object from a spherical representation to a spherical representation, applications of these apparatuses, methods and computer programs are also described.

Apparatuses for converting an object position of an audio object, audio stream provider, audio content production system, audio playback apparatus, methods and computer programs

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Rohr, Germany

Matthias Neusinger