Apparatus and method for processing a decoded audio signal in a spectral domain

US9583110B2 · kind B2 · utility

Assignee

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

Inventors

• Guillaume Fuchs · Erlangen, DE
• Ralf Geiger · Erlangen, DE
• Markus Schnell · Nuremberg, DE
• Emmanuel Ravelli · Erlangen, DE
• Stefan Doehla · Erlangen, DE

Key dates

• Filing date: Aug 14, 2013
• Grant date: Feb 28, 2017
• Expiry date: Feb 6, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L25/06
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for processing a decoded audio signal including a filter for filtering the decoded audio signal to obtain a filtered audio signal, a time-spectral converter stage for converting the decoded audio signal and the filtered audio signal into corresponding spectral representations, each spectral representation having a plurality of subband signals, a weighter for performing a frequency selective weighting of the filtered audio signal by a multiplying subband signals by respective weighting coefficients to obtain a weighted filtered audio signal, a subtractor for performing a subband-wise subtraction between the weighted filtered audio signal and the spectral representation of the decoded audio signal, and a spectral-time converter for converting the result audio signal or a signal derived from the result audio signal into a time domain representation to obtain a processed decoded audio signal.