Device and method for improved magnitude response and temporal alignment in a phase vocoder based bandwidth extension method for audio signals

US9318127B2 · kind B2 · utility

Assignees

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

Inventors

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

Key dates

• Filing date: Sep 5, 2012
• Grant date: Apr 19, 2016
• Expiry date: Aug 18, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L21/038
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for generating a bandwidth extended audio signal from an input signal, includes a patch generator for generating one or more patch signals from the input signal, wherein the patch generator is configured for performing a time stretching of subband signals from an analysis filterbank, and wherein the patch generator further includes a phase adjuster for adjusting phases of the subband signals using a filterbank-channel dependent phase correction.