Harmonicity-dependent controlling of a harmonic filter tool

US10083706B2 · kind B2 · utility

Assignee

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

Inventors

• Goran Markovic · Nuremberg, DE
• Christian Helmrich · Erlangen, DE
• Emmanuel Ravelli · Erlangen, DE
• Manuel Jander · Hemhofen, DE
• Stefan Doehla · Erlangen, DE

Key dates

• Filing date: Jan 20, 2017
• Grant date: Sep 25, 2018
• Expiry date: Jan 20, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L25/90
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

The coding efficiency of an audio codec using a controllable—switchable or even adjustable—harmonic filter tool is improved by performing the harmonicity-dependent controlling of this tool using a temporal structure measure in addition to a measure of harmonicity in order to control the harmonic filter tool. In particular, the temporal structure of the audio signal is evaluated in a manner which depends on the pitch. This enables to achieve a situation-adapted control of the harmonic filter tool so that in situations where a control made solely based on the measure of harmonicity would decide against or reduce the usage of this tool, although using the harmonic filter tool would, in that situation, increase the coding efficiency, the harmonic filter tool is applied, while in other situations where the harmonic filter tool may be inefficient or even destructive, the control reduces the appliance of the harmonic filter tool appropriately.