Noise filer, noise filling parameter calculator encoded audio signal representation, methods and computer program

US8983851B2 · kind B2 · utility

Assignee

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

Inventors

• Nikolaus Rettelbach · Nuremberg, DE
• Bernhard Grill · Lautenbächle, DE
• Guillaume Fuchs · Erlangen, DE
• Stefan Geyersberger · Erlangen, DE
• Markus Multrus · Nuremberg, DE
• Harald Popp · Tuchenbach, DE
• Juergen Herre · Erlangen, DE
• Stefan Wabnik · Ilmenau, DE
• Gerald Schuller · Erfurt, DE
• Jens Hirschfeld · Heringen, DE

Key dates

• Filing date: Jan 11, 2011
• Grant date: Mar 17, 2015
• Expiry date: Oct 17, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L25/18
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A noise filler for providing a noise-filled spectral representation of an audio signal on the basis of an input spectral representation of the audio signal has a spectral region identifier configured to identify spectral regions of the input spectral representation spaced from non-zero spectral regions of the input spectral representation by at least one intermediate spectral region, to obtain identified spectral regions, and a noise inserter configured to selectively introduce noise into the identified spectral regions to obtain the noise-filled spectral representation of the audio signal. A noise filling parameter calculator for providing a noise filling parameter on the basis of a quantized spectral representation of an audio signal has a spectral region identifier, as mentioned above, and a noise value calculator configured to selectively consider quantization errors of the identified spectral regions for a calculation of the noise filling parameter. Accordingly, an encoded audio signal representation representing the audio signal can be obtained.