Apparatus and a method for decoding an encoded audio signal

US8275626B2 · kind B2 · utility

Assignee

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

Inventors

• Max Neuendorf · Nuremberg, DE
• Bernhard Grill · Lautenbächle, DE
• Ulrich Kraemer · Stuttgart, DE
• Markus Multrus · Nuremberg, DE
• Harald Popp · Tuchenbach, DE
• Nikolaus Rettelbach · Nuremberg, DE
• Frederik Nagel · Nuremberg, DE
• Markus Lohwasser · Hersbruck, DE
• Marc Gayer · Erlangen, DE
• Manuel Jander · Hemhofen, DE
• Virgilio Bacigalupo · Nuremberg, DE

Key dates

• Filing date: Jan 11, 2011
• Grant date: Sep 25, 2012
• Expiry date: Jan 11, 2031

Classification

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

Abstract

An apparatus for decoding an encoded audio signal having first and second portions encoded in accordance with first and second encoding algorithms, respectively, BWE parameters for the first and second portions and a coding mode information indicating a first or a second decoding algorithm, includes first and second decoders, a BWE module and a controller. The decoders decode portions in accordance with decoding algorithms for time portions of the encoded signal to obtain decoded signals. The BWE module has a controllable crossover frequency and is configured for performing a bandwidth extension algorithm using the first decoded signal and the BWE parameters for the first portion, and for performing a bandwidth extension algorithm using the second decoded signal and the bandwidth extension parameter for the second portion. The controller controls the crossover frequency for the BWE module in accordance with the coding mode information.