Multi-resolution switched audio encoding/decoding scheme

US8447620B2 · kind B2 · utility

Assignees

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

Inventors

• Max Neuendorf · Nuremberg, DE
• Stefan Bayer · Nuremberg, DE
• Jérémie Lecomte · Santa Clara, US
• Guillaume Fuchs · Erlangen, DE
• Julien Robilliard · Nuremberg, DE
• Nikolaus Rettelbach · Nuremberg, DE
• Frederik Nagel · Nuremberg, DE
• Ralf Geiger · Erlangen, DE
• Markus Multrus · Nuremberg, DE
• Bernhard Grill · Lautenbächle, DE
• Philippe Gournay · Sherbrooke, CA
• Redwan Salami · Delta, CA

Key dates

• Filing date: Apr 6, 2011
• Grant date: May 21, 2013
• Expiry date: Jun 10, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L2019/0008
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio encoder for encoding an audio signal has a first coding branch, the first coding branch comprising a first converter for converting a signal from a time domain into a frequency domain. Furthermore, the audio encoder has a second coding branch comprising a second time/frequency converter. Additionally, a signal analyzer for analyzing the audio signal is provided. The signal analyzer, on the hand, determines whether an audio portion is effective in the encoder output signal as a first encoded signal from the first encoding branch or as a second encoded signal from a second encoding branch. On the other hand, the signal analyzer determines a time/frequency resolution to be applied by the converters when generating the encoded signals. An output interface includes, in addition to the first encoded signal and the second encoded signal, a resolution information identifying the resolution used by the first time/frequency converter and used by the second time/frequency converter.