Apparatus and method for generating a bandwidth extended signal

US8880410B2 · kind B2 · utility

Assignee

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

Inventors

• Frederik Nagel · Nuremberg, DE
• Sascha Disch · Bad Mergentheim, DE
• Max Neuendorf · Nuremberg, DE
• Stefan Bayer · Nuremberg, DE
• Marc Gayer · Erlangen, DE
• Markus Lohwasser · Hersbruck, DE
• Nikolaus Rettelbach · Nuremberg, DE
• Ulrich Kraemer · Stuttgart, DE

Key dates

• Filing date: Jan 11, 2011
• Grant date: Nov 4, 2014
• Expiry date: Apr 19, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L21/038
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for generating a bandwidth extended signal from an input signal includes a patch generator and a combiner. The input signal is represented for first and second bands by first and second resolution data, respectively, the second resolution being lower than the first. The patch generator generates first and second patches from the first band of the input signal according to first and second patching algorithms, respectively. A spectral density of the second patch generated using the second patching algorithm is higher than a spectral density of a first patch generated using the first patching algorithm. The combiner combines both patches and the first band of the input signal to obtain the bandwidth extended signal. The apparatus scales the input signal according to the first and second patching algorithms or scales the first and second patches, so that the bandwidth extended signal fulfills a spectral envelope criterion.