Audio encoder and decoder using a frequency domain processor with full-band gap filling and a time domain processor

US10332535B2 · kind B2 · utility

Assignee

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

Inventors

• Sascha Disch · Bad Mergentheim, DE
• Martin Dietz · Nuremberg, DE
• Markus Multrus · Nuremberg, DE
• Guillaume Fuchs · Erlangen, DE
• Emmanuel Ravelli · Erlangen, DE
• Matthias Neusinger · Meiningen, DE
• Markus Schnell · Nuremberg, DE
• Benjamin Schubert · Nuremberg, DE
• Bernhard Grill · Lautenbächle, DE

Key dates

• Filing date: Jan 24, 2017
• Grant date: Jun 25, 2019
• Expiry date: Feb 25, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L21/038
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio encoder for encoding an audio signal has: a first encoding processor for encoding a first audio signal portion in a frequency domain, having: a time frequency converter for converting the first audio signal portion into a frequency domain representation; an analyzer for analyzing the frequency domain representation to determine first spectral portions to be encoded with a first spectral resolution and second regions to be encoded with a second resolution; and a spectral encoder for encoding the first spectral portions with the first spectral resolution and encoding the second portions with the second resolution; a second encoding processor for encoding a second different audio signal portion in the time domain; a controller for analyzing and determining, which portion of the audio signal is the first audio signal portion encoded in the frequency domain and which portion is the second audio signal portion encoded in the time domain; and an encoded signal former for forming an encoded audio signal having a first encoded signal portion for the first audio signal portion and a second encoded signal portion for the second portion.