Low bitrate audio encoding/decoding scheme having cascaded switches

US11823690B2 · kind B2 · utility

Assignee

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

Inventors

• Bernhard Grill · Lautenbächle, DE
• Roch Lefebvre · Magog, CA
• Bruno Bessette · Sherbrooke, CA
• Jimmy Lapierre · Orford, CA
• Philippe Gournay · Sherbrooke, CA
• Redwan Salami · Delta, CA
• Stefan Bayer · Nuremberg, DE
• Guillaume Fuchs · Erlangen, DE
• Stefan Geyersberger · Erlangen, DE
• Ralf Geiger · Erlangen, DE
• Johannes Hilpert · Nuremberg, DE
• Ulrich Kraemer · Stuttgart, DE
• Jérémie Lecomte · Santa Clara, US
• Markus Multrus · Nuremberg, DE
• Max Neuendorf · Nuremberg, DE
• Harald Popp · Tuchenbach, DE
• Nikolaus Rettelbach · Nuremberg, DE

Key dates

• Filing date: Sep 20, 2022
• Grant date: Nov 21, 2023
• Expiry date: Sep 20, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L2019/0008
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

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.