Multi-mode audio encoder and audio decoder with spectral shaping in a linear prediction mode and in a frequency-domain mode

US8744863B2 · kind B2 · utility

Assignee

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

Inventors

• Max Neuendorf · Nuremberg, DE
• Guillaume Fuchs · Erlangen, DE
• Nikolaus Rettelbach · Nuremberg, DE
• Tom Baeckstroem · Nuremberg, DE
• Jérémie Lecomte · Santa Clara, US
• Juergen Herre · Erlangen, DE

Key dates

• Filing date: Apr 6, 2012
• Grant date: Jun 3, 2014
• Expiry date: Apr 6, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/022
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A multi-mode audio signal decoder has a spectral value determinator to obtain sets of decoded spectral coefficients for a plurality of portions of an audio content and a spectrum processor configured to apply a spectral shaping to a set of spectral coefficients in dependence on a set of linear-prediction-domain parameters for a portion of the audio content encoded in a linear-prediction mode, and in dependence on a set of scale factor parameters for a portion of the audio content encoded in a frequency-domain mode. The audio signal decoder has a frequency-domain-to-time-domain converter configured to obtain a time-domain audio representation on the basis of a spectrally-shaped set of decoded spectral coefficients for a portion of the audio content encoded in the linear-prediction mode and for a portion of the audio content encoded in the frequency domain mode. An audio signal encoder is also described.