Bandwidth extension encoder for encoding an audio signal using a window controller

US8606586B2 · kind B2 · utility

Assignee

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

Inventors

• Frederik Nagel · Nuremberg, DE
• Markus Multrus · Nuremberg, DE
• Sascha Disch · Bad Mergentheim, DE
• Jérémie Lecomte · Santa Clara, US
• Christian Ertel · Eckental, DE
• Patrick Warmbold · Emskirchen, DE

Key dates

• Filing date: Dec 22, 2011
• Grant date: Dec 10, 2013
• Expiry date: Feb 21, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/20
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A bandwidth extension encoder for encoding an audio signal has a signal analyzer, a core encoder, a parameter calculator, and a window controller. The audio signal has a low frequency signal having a core frequency band and a high frequency signal having an upper frequency band. The signal analyzer is configured for analyzing the audio signal, the audio signal having a block of audio samples, the block having a specified length in time. The signal analyzer is furthermore configured for determining from a plurality of analysis windows an analysis window to be used for performing a bandwidth extension in a bandwidth extension decoder. The core encoder is configured for encoding the low frequency signal to acquire an encoded or frequency signal. The parameter calculator is configured for calculating bandwidth extension parameters from the high frequency signal. The window controller is configured to provide control information indicating analysis window functions.