Apparatus and method for generating a synthesis audio signal and for encoding an audio signal

US9076433B2 · kind B2 · utility

Assignee

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

Inventors

• Frederik Nagel · Nuremberg, DE
• Markus Multrus · Nuremberg, DE
• Jérémie Lecomte · Santa Clara, US
• Stefan Bayer · Nuremberg, DE
• Guillaume Fuchs · Erlangen, DE
• Johannes Hilpert · Nuremberg, DE
• Julien Robilliard · Nuremberg, DE

Key dates

• Filing date: Nov 28, 2012
• Grant date: Jul 7, 2015
• Expiry date: Feb 16, 2033

Classification

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

Abstract

An apparatus for generating a synthesis audio signal using a patching control signal has a first converter, a spectral domain patch generator, a high frequency reconstruction manipulator and a combiner. The first converter is configured for converting a time portion of an audio signal into a spectral representation. The spectral domain patch generator is configured for performing a plurality of different spectral domain patching algorithms, wherein each patching algorithm generates a modified spectral representation having spectral components in an upper frequency band derived from corresponding spectral components in a core frequency band of the audio signal. The spectral domain patch generator is furthermore configured to select a first spectral domain patching algorithm from the plurality of patching algorithms for a first time portion and a second spectral domain patching algorithm from the plurality of patching algorithm for a second different time portion in accordance with the patching control signal to obtain the modified spectral representation.