Audio encoder, audio decoder and audio processor having a dynamically variable warping characteristic

US7873511B2 · kind B2 · utility

Assignee

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

Inventors

• Juergen Herre · Erlangen, DE
• Bernhard Grill · Lautenbächle, DE
• Markus Multrus · Nuremberg, DE
• Stefan Bayer · Nuremberg, DE
• Ulrich Kraemer · Stuttgart, DE
• Jens Hirschfeld · Heringen, DE
• Stefan Wabnik · Ilmenau, DE
• Gerald Schuller · Erfurt, DE

Key dates

• Filing date: Jun 30, 2006
• Grant date: Jan 18, 2011
• Expiry date: Nov 18, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/22
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio encoder, an audio decoder or an audio processor includes a filter for generating a filtered audio signal, the filter having a variable warping characteristic, the characteristic being controllable in response to a time-varying control signal, the control signal indicating a small or no warping characteristic or a comparatively high warping characteristic. Furthermore, a controller is connected for providing the time-varying control signal, which depends on the audio signal. The filtered audio signal can be introduced to an encoding processor having different encoding algorithms, one of which is a coding algorithm adapted to a specific signal pattern. Alternatively, the filter is a post-filter receiving a decoded audio signal.