Audio encoder, method for providing output signal, bandwidth extension decoder, and method for providing bandwidth extended audio signal

US8401862B2 · kind B2 · utility

Assignee

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

Inventors

• Frederik Nagel · Nuremberg, DE
• Sascha Disch · Bad Mergentheim, DE
• Guillaume Fuchs · Erlangen, DE
• Juergen Herre · Erlangen, DE
• Christian Greibel · Nuremberg, DE

Key dates

• Filing date: Jun 13, 2011
• Grant date: Mar 19, 2013
• Expiry date: Jun 13, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/24
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio encoder for providing an output signal using an input audio signal includes a patch generator, a comparator and an output interface. The patch generator generates at least one bandwidth extension high-frequency signal, wherein a bandwidth extension high-frequency signal includes a high-frequency band. The high-frequency band of the bandwidth extension high-frequency signal is based on a low frequency band of the input audio signal. A comparator calculates a plurality of comparison parameters. A comparison parameter is calculated based on a comparison of the input audio signal and a generated bandwidth extension high-frequency signal. Each comparison parameter of the plurality of comparison parameters is calculated based on a different offset frequency between the input audio signal and a generated bandwidth extension high-frequency signal. Further, the comparator determines a comparison parameter from the plurality of comparison parameters, wherein the determined comparison parameter fulfils a predefined criterion.