Generation of a comfort noise with high spectro-temporal resolution in discontinuous transmission of audio signals

US9583114B2 · kind B2 · utility

Assignee

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

Inventors

• Anthony Lombard · Erlangen, DE
• Martin Dietz · Nuremberg, DE
• Stephan Wilde · Wendelstein, DE
• Emmanuel Ravelli · Erlangen, DE
• Panji Setiawan · Munich, DE
• Markus Multrus · Nuremberg, DE

Key dates

• Filing date: Jun 19, 2015
• Grant date: Feb 28, 2017
• Expiry date: Jun 19, 2035

Classification

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

Abstract

The invention provides an audio decoder being configured for decoding a bitstream so as to produce therefrom an audio output signal, the bitstream including at least an active phase followed by at least an inactive phase, wherein the bitstream has encoded therein at least a silence insertion descriptor frame which describes a spectrum of a background noise, the audio decoder including: a silence insertion descriptor decoder configured to decode the silence insertion descriptor frame; a decoding device configured to reconstruct the audio output signal from the bitstream during the active phase; a spectral converter configured to determine a spectrum of the audio output signal; a noise estimator device configured to determine a first spectrum of the noise of the audio output signal; a resolution converter configured to establish a second spectrum of the noise of the audio output signal; a comfort noise spectrum estimation device; and a comfort noise generator.