Voiceage Corporation

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

Voiceage Evs LLC

Nokia Corporation

Koninklijke Philips Corporation N.v.

Dolby International Ab

Voiceage Evs Gmbh & Co. Kg

Redwan Salami

Bruno Bessette

Philippe Gournay

Roch Lefebvre

Nikolaus Rettelbach

Max Neuendorf

Stefan Bayer

Markus Multrus

Guillaume Fuchs

Bernhard Grill

Ralf Geiger

Johannes Hilpert

Harald Popp

Ulrich Kraemer

Jimmy Lapierre

Stefan Geyersberger

Jérémie Lecomte

Milan Jelinek

Vaclav Eksler

Tommy Vaillancourt

Frederik Nagel

Julien Robilliard

Vladimir Malenovsky

Lars Villemoes

Albertus Cornelis Den Brinker

Bernard Grill

Raif Geiger

Stefam Geyersberger

Vlaclav Eksler

Ulrich KRÄMER

Albertus C Den Brinker

An audio encoder has a first information sink oriented encoding branch such as a spectral domain encoding branch, a second information source or SNR oriented encoding branch such as an LPC-domain encoding branch, and a switch for switching between the first and second encoding branches, the second encoding branch having a converter into a specific domain different from the spectral domain such as an LPC analysis stage generating an excitation signal, and the second encoding branch having a specific domain coding branch such as LPC domain processing branch, and a specific spectral domain coding branch such as LPC spectral domain processing branch, and an additional switch for switching between the specific domain coding branch and the specific spectral domain coding branch. An audio decoder has a first domain decoder, a second domain decoder, and a third domain decoder as well as two cascaded switches for switching between the decoders.

Low bitrate audio encoding/decoding scheme having cascaded switches

Methods, an encoder and a decoder are configured for transition between frames with different internal sampling rates. Linear predictive (LP) filter parameters are converted from a sampling rate Sto a sampling rate S. A power spectrum of a LP synthesis filter is computed, at the sampling rate S, using the LP filter parameters. The power spectrum of the LP synthesis filter is modified to convert it from the sampling rate Sto the sampling rate S. The modified power spectrum of the LP synthesis filter is inverse transformed to determine autocorrelations of the LP synthesis filter at the sampling rate S. The autocorrelations are used to compute the LP filter parameters at the sampling rate S

Methods, encoder and decoder for linear predictive encoding and decoding of sound signals upon transition between frames having different sampling rates

Audio decoding device and method with decoding branches for decoding audio signal encoded in a plurality of domains

A device and a method for quantizing a LPC filter in the form of an input vector in a quantization domain, comprises a calculator of a first-stage approximation of the input vector, a subtractor of the first-stage approximation from the input vector to produce a residual vector, a calculator of a weighting function from the first-stage approximation, a warper of the residual vector with the weighting function, and a quantizer of the weighted residual vector to supply a quantized weighted residual vector. A device and a method for inverse quantizing of a LPC filter, comprises means for receiving coded indices representative of a first-stage approximation of a vector representative of the LPC filter in a quantization domain and of a quantized weighted residual version of the vector, a calculator of an inverse weighting function from the first-stage approximation, an inverse quantizer of the quantized weighted residual version of the vector to produce a weighted residual vector, a multiplier of the weighted residual vector by the inverse weighting function to produce a residual vector, and an adder of the first-stage approximation with the residual vector to produce the vector representative of the LPC filter in the quantization domain.

Variable bit rate LPC filter quantizing and inverse quantizing device and method

An audio encoder has a first information sink oriented encoding branch, a second information source or SNR oriented encoding branch, and a switch for switching between the first encoding branch and the second encoding branch, wherein the second encoding branch has a converter into a specific domain different from the spectral domain, and wherein the second encoding branch furthermore has a specific domain coding branch, and a specific spectral domain coding branch, and an additional switch for switching between the specific domain coding branch and the specific spectral domain coding branch. An audio decoder has a first domain decoder, a second domain decoder for decoding a signal, and a third domain decoder and two cascaded switches for switching between the decoders.

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