Apparatus and method for calculating bandwidth extension data using a spectral tilt controlled framing

US8788276B2 · kind B2 · utility

Assignee

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

Inventors

• Max Neuendorf · Nuremberg, DE
• Ulrich Kraemer · Stuttgart, DE
• Frederik Nagel · Nuremberg, DE
• Sascha Disch · Bad Mergentheim, DE
• Stefan Wabnik · Ilmenau, DE

Key dates

• Filing date: Jun 23, 2009
• Grant date: Jul 22, 2014
• Expiry date: Sep 10, 2031

Classification

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

Abstract

An apparatus for calculating bandwidth extension data of an audio signal in a bandwidth extension system, in which a first spectral band is encoded with a first number of bits and a second spectral band different from the first spectral band is encoded with a second number of bits, the second number of bits being smaller than the first number of bits, has a controllable bandwidth extension parameter calculator for calculating bandwidth extension parameters for the second frequency band in a frame-wise manner for a sequence of frames of the audio signal. Each frame has a controllable start time instant. The apparatus additionally includes a spectral tilt detector for detecting a spectral tilt in a time portion of the audio signal and for signaling the start time instant for the individual frames of the audio signal depending on spectral tilt.