Apparatus and method for generating a high frequency audio signal using adaptive oversampling

US9159337B2 · kind B2 · utility

Assignees

• Dolby International AB · IE
• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Lars Villemoes · Stockholm, SE
• Per Ekstrand · Saltsjöbaden, SE
• Sascha Disch · Bad Mergentheim, DE
• Frederik Nagel · Nuremberg, DE
• Stephan Wilde · Wendelstein, DE

Key dates

• Filing date: May 25, 2010
• Grant date: Oct 13, 2015
• Expiry date: Jun 29, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/025
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for generating a high frequency audio signal that includes an analyzer for analyzing an input signal to determine a transient information adaptively. Additionally a spectral converter is provided for converting the input signal into an input spectral representation. A spectral processor processes the input spectral representation to generate a processed spectral representation including values for higher frequencies than the input spectral representation. A time converter is configured for converting the processed spectral representation to a time representation, wherein the spectral converter or the time converter are controllable to perform a frequency domain oversampling for the first portion of the input signal having the transient information associated and to not perform the frequency domain oversampling for the second portion of the input signal not having the associated transient information.