Apparatus and method for modifying an input audio signal

US8812308B2 · kind B2 · utility

Assignee

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

Inventors

• Christian Uhle · Nuremberg, DE
• Juergen Herre · Erlangen, DE
• Oliver Hellmuth · Erlangen, DE
• Stefan Finauer · Erlangen, DE

Key dates

• Filing date: Oct 18, 2012
• Grant date: Aug 19, 2014
• Expiry date: Oct 18, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L25/69
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for modifying an input audio signal has an excitation determiner, a storage device and a signal modifier. The excitation determiner determines a value of an excitation parameter of a subband of a plurality of subbands of the input audio signal based on an energy content of the subband. Further, the storage device stores a lookup table containing a plurality of spectral weighting factors. A spectral weighting factor of the plurality of spectral weighting factors is associated to a predefined value of the excitation parameter and a subband of the plurality of subbands. The storage device provides a spectral weighting factor corresponding to the determined value of the excitation parameter and corresponding to the subband, the value of the excitation parameter is determined for. Further, the signal modifier modifies a content of the subband of the audio signal, the value of the excitation parameter is determined for, based on the provided spectral weighting factor to provide a modified subband.