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

Stefan Wabnik

Bernhard Grill

Gerald Schuller

Jens Hirschfeld

Nikolaus Rettelbach

Juergen Herre

Markus Multrus

Stefan Geyersberger

Harald Popp

Guillaume Fuchs

Ulrich Kraemer

Frederik Nagel

Ernst Eberlein

Marco Breiling

Giovanni Del Galdo

Tobias Bliem

Juliane Borsum

Bert Greevenbosch

Reinhard Zitzmann

Sascha Disch

Max Neuendorf

Stefan Kraegeloh

Joerg Pickel

Stefan Bayer

Manfred Lutzky

Alexander Zink

Yoshikazu Yokotani

Ralf Geiger

Johannes Hilpert

Jürgen Herre

Marc Gayer

Wolfgang Fiesel

Stefan Krägeloh

Jörg Pickel

Ulrich KRÄMER

Giovanni Del Gardo

Ulrich Krämer

Nikolaus Rettlebach

An encoder for providing an audio stream on the basis of a transform-domain representation of an input audio signal includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error. A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal includes a noise filler for introducing noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

Audio encoder, audio decoder, methods for encoding and decoding an audio signal, audio stream and a computer program

An encoder provides an audio stream based on a transform-domain representation of an input audio signal and includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error. A decoder provides a decoded representation of an audio signal based on an encoded audio stream representing spectral components of frequency bands of the audio signal and includes a noise filler for introducing noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

An encoder for providing an audio stream on the basis of a transform- domain representation of an input audio signal includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error. A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal includes a noise filler for introducing noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

Audio encoder, audio decoder, methods for encoding and decoding an audio signal, and a computer program

An audio signal synthesizer generates a synthesis audio signal having a first frequency band and a second synthesized frequency band derived from the first frequency band and comprises a patch generator, a spectral converter, a raw signal processor and a combiner. The patch generator performs at least two different patching algorithms, each patching algorithm generating a raw signal. The patch generator is adapted to select one of the at least two different patching algorithms in response to a control information. The spectral converter converts the raw signal into a raw signal spectral representation. The raw signal processor processes the raw signal spectral representation in response to spectral domain spectral band replication parameters to obtain an adjusted raw signal spectral representation.

Audio signal synthesizer and audio signal encoder

A very coarse quantization exceeding the measure determined by the masking threshold without or only very little quality losses is enabled by quantizing not immediately the prefiltered signal, but a prediction error obtained by forward-adaptive prediction of the prefiltered signal. Due to the forward adaptivity, the quantizing error has no negative effect on the prediction on the decoder side.

System, method, and non-transitory computer readable medium storing a program utilizing a postfilter for filtering a prefiltered audio signal in a decoder

Audio signal encoder and method for generating a data stream having components of an audio signal in a first frequency band, control information and spectral band replication parameters

Information signal encoding using a forward-adaptive prediction and a backwards-adaptive quantization

For generating a signal to be transmitted original information is encoded into a main channel and a side channel, wherein the side channel is more robust against channel influences than the main channel. On the receiver side, when the receive quality is above a threshold, which is necessitated to execute a successful decoding of the main channel, the main channel is reproduced. If the receive quality falls below this threshold, however, the side channel is reproduced which may have less bits than the main channel and which is a correspondingly lower quality representation of the original information than the main channel.

Device and method for generating and decoding a side channel signal transmitted with a main channel signal

Growing community of inventors

Ilmenau, Germany

Stefan Wabnik