Apparatus and method for encoding or decoding an audio signal with intelligent gap filling in the spectral domain

US11289104B2 · kind B2 · utility

Assignee

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

Inventors

• Sascha Disch · Bad Mergentheim, DE
• Frederik Nagel · Nuremberg, DE
• Ralf Geiger · Erlangen, DE
• Balaji Nagendran Thoshkahna · Erlangen, DE
• Konstantin Schmidt · Nuremberg, DE
• Stefan Bayer · Nuremberg, DE
• Christian Neukam · Kalchreuth, DE
• Bernd Edler · Hannover, DE
• Christian Helmrich · Erlangen, DE

Key dates

• Filing date: Feb 26, 2019
• Grant date: Mar 29, 2022
• Expiry date: Dec 30, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/02
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for decoding an encoded audio signal, includes a spectral domain audio decoder for generating a first decoded representation of a first set of first spectral portions, the decoded representation having a first spectral resolution; a parametric decoder for generating a second decoded representation of a second set of second spectral portions having a second spectral resolution being lower than the first spectral resolution; a frequency regenerator for regenerating every constructed second spectral portion having the first spectral resolution using a first spectral portion and spectral envelope information for the second spectral portion; and a spectrum time converter for converting the first decoded representation and the reconstructed second spectral portion into a time representation.