Time domain level adjustment for audio signal decoding or encoding

US9830915B2 · kind B2 · utility

Assignee

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

Inventors

• Stephan Schreiner · Frechetsfeld, DE
• Arne Borsum · Erlangen, DE
• Matthias Neusinger · Meiningen, DE
• Manuel Jander · Hemhofen, DE
• Markus Lohwasser · Hersbruck, DE
• Bernhard Neugebauer · Erlangen, DE

Key dates

• Filing date: Jul 9, 2015
• Grant date: Nov 28, 2017
• Expiry date: Nov 26, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L21/034
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio signal decoder for providing a decoded audio signal representation on the basis of an encoded audio signal representation has a decoder preprocessing stage for obtaining a plurality of frequency band signals from the encoded audio signal representation, a clipping estimator, a level shifter, a frequency-to-time-domain converter, and a level shift compensator. The clipping estimator analyzes the encoded audio signal representation and/or side information relative to a gain of the frequency band signals in order to determine a current level shift factor. The level shifter shifts levels of the frequency band signals according to the level shift factor. The frequency-to-time-domain converter converts the level shifted frequency band signals into a time-domain representation. The level shift compensator acts on the time-domain representation for at least partly compensating a corresponding level shift and for obtaining a substantially compensated time-domain representation.