Audio decoder, method and computer program using a zero-input-response to obtain a smooth transition

US11922961B2 · kind B2 · utility

Assignee

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

Inventors

• Emmanuel Ravelli · Erlangen, DE
• Guillaume Fuchs · Erlangen, DE
• Sascha Disch · Bad Mergentheim, DE
• Markus Multrus · Nuremberg, DE
• Grzegorz Pietrzyk · Nuremberg, DE
• Benjamin Schubert · Nuremberg, DE

Key dates

• Filing date: Sep 20, 2021
• Grant date: Mar 5, 2024
• Expiry date: Oct 13, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/12
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio decoder for providing a decoded audio information on the basis of an encoded audio information includes a linear-prediction-domain decoder configured to provide a first decoded audio information on the basis of an audio frame encoded in a linear prediction domain, a frequency domain decoder configured to provide a second decoded audio information on the basis of an audio frame encoded in a frequency domain, and a transition processor. The transition processor is configured to obtain a zero-input-response of a linear predictive filtering, wherein an initial state of the linear predictive filtering is defined depending on the first decoded audio information and the second decoded audio information, and modify the second decoded audio information depending on the zero-input-response, to obtain a smooth transition between the first and the modified second decoded audio information.