Apparatus and method for processing an audio signal using a harmonic post-filter

US11037580B2 · kind B2 · utility

Assignee

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

Inventors

• Emmanuel Ravelli · Erlangen, DE
• Christian Helmrich · Erlangen, DE
• Goran Markovic · Nuremberg, DE
• Matthias Neusinger · Meiningen, DE
• Sascha Disch · Bad Mergentheim, DE
• Manuel Jander · Hemhofen, DE
• Martin Dietz · Nuremberg, DE

Key dates

• Filing date: Feb 27, 2019
• Grant date: Jun 15, 2021
• Expiry date: Feb 27, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L21/02
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for processing an audio signal having associated therewith a pitch lag information and a gain information, includes a domain converter for converting a first domain representation of the audio signal into a second domain representation of the audio signal; and a harmonic post-filter for filtering the second domain representation of the audio signal, wherein the post-filter is based on a transfer function including a numerator and a denominator, wherein the numerator includes a gain value indicated by the gain information, and wherein the denominator includes an integer part of a pitch lag indicated by the pitch lag information and a multi-tap filter depending on a fractional part of the pitch lag.