Time warp activation signal provider, audio signal encoder, method for providing a time warp activation signal, method for encoding an audio signal and computer programs

US9015041B2 · kind B2 · utility

Assignee

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

Inventors

• Stefan Bayer · Nuremberg, DE
• Sascha Disch · Bad Mergentheim, DE
• Ralf Geiger · Erlangen, DE
• Guillaume Fuchs · Erlangen, DE
• Max Neuendorf · Nuremberg, DE
• Gerald Schuller · Erfurt, DE
• Bernd Edler · Hannover, DE

Key dates

• Filing date: Jan 11, 2011
• Grant date: Apr 21, 2015
• Expiry date: Feb 10, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L25/78
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio encoder has a window function controller, a windower, a time warper with a final quality check functionality, a time/frequency converter, a TNS stage or a quantizer encoder, the window function controller, the time warper, the TNS stage or an additional noise filling analyzer are controlled by signal analysis results obtained by a time warp analyzer or a signal classifier. Furthermore, a decoder applies a noise filling operation using a manipulated noise filling estimate depending on a harmonic or speech characteristic of the audio signal.