Audio encoder, audio decoder, method for providing an encoded audio information, method for providing a decoded audio information, computer program and encoded representation using a signal-adaptive bandwidth extension

US9646624B2 · kind B2 · utility

Assignee

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

Inventors

• Sascha Disch · Bad Mergentheim, DE
• Christian Helmrich · Erlangen, DE
• Johannes Hilpert · Nuremberg, DE
• Julien Robilliard · Nuremberg, DE
• Konstantin Schmidt · Nuremberg, DE
• Stephan Wilde · Wendelstein, DE

Key dates

• Filing date: Jul 28, 2015
• Grant date: May 9, 2017
• Expiry date: Jul 28, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L21/038
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio encoder has a low frequency encoder which encodes a low frequency portion of the input audio information to obtain an encoded representation of the low frequency portion, and a bandwidth extension information provider which provides bandwidth extension information. The audio encoder is configured to selectively include bandwidth extension information into the encoded audio information in a signal-adaptive manner. An audio decoder has a low frequency decoder which decodes an encoded representation of a low frequency portion to obtain a decoded representation of the low frequency portion, and a bandwidth extension which obtains a bandwidth extension signal using a blind bandwidth extension for portions of an audio content for which no bandwidth extension parameters are included in the encoded audio information, and which obtains the bandwidth extension signal using a parameter-guided bandwidth extension for portions of the audio content for which bandwidth extension parameters are included in the encoded audio information.