Apparatus and method realizing a fading of an MDCT spectrum to white noise prior to FDNS application

US10607614B2 · kind B2 · utility

Assignee

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

Inventors

• Michael Schnabel · Lauffen am Neckar, DE
• Goran Markovic · Nuremberg, DE
• Ralph Sperschneider · Erlangen, DE
• Jérémie Lecomte · Santa Clara, US
• Christian Helmrich · Erlangen, DE

Key dates

• Filing date: Apr 9, 2018
• Grant date: Mar 31, 2020
• Expiry date: Apr 9, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L2019/0016
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for decoding an encoded audio signal to obtain a reconstructed audio signal includes a receiving interface for receiving one or more frames comprising information on a plurality of audio signal samples of an audio signal spectrum of the encoded audio signal, and a processor for generating the reconstructed audio signal. The processor is configured to generate the reconstructed audio signal by fading a modified spectrum to a target spectrum, if a current frame is not received by the receiving interface or if the current frame is received by the receiving interface but is corrupted, wherein the modified spectrum includes a plurality of modified signal samples, wherein, for each of the modified signal samples of the modified spectrum, an absolute value of the modified signal sample is equal to an absolute value of one of the audio signal samples of the audio signal spectrum.