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

US11024323B2 · kind B2 · utility

Assignee

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

Inventors

• Nikolaus Rettelbach · Nuremberg, DE
• Bernhard Grill · Lautenbächle, DE
• Guillaume Fuchs · Erlangen, DE
• Stefan Geyersberger · Erlangen, DE
• Markus Multrus · Nuremberg, DE
• Harald Popp · Tuchenbach, DE
• Juergen Herre · Erlangen, DE
• Stefan Wabnik · Ilmenau, DE
• Gerald Schuller · Erfurt, DE
• Jens Hirschfeld · Heringen, DE

Key dates

• Filing date: Jul 7, 2017
• Grant date: Jun 1, 2021
• Expiry date: Jul 7, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L25/18
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

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.