Audio encoder and decoder using a frequency domain processor, a time domain processor, and a cross processing for continuous initialization

US11410668B2 · 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: Mar 1, 2019
• Grant date: Aug 9, 2022
• Expiry date: May 20, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L2019/0001
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio encoder for encoding an audio signal includes: a first encoding processor for encoding a first audio signal portion in a frequency domain, wherein the first encoding processor includes: a time frequency converter for converting the first audio signal portion into a frequency domain representation having spectral lines up to a maximum frequency of the first audio signal portion; a spectral encoder for encoding the frequency domain representation; a second encoding processor for encoding a second different audio signal portion in the time domain; a cross-processor for calculating, from the encoded spectral representation of the first audio signal portion, initialization data of the second encoding processor, so that the second encoding processing is initialized to encode the second audio signal portion immediately following the first audio signal portion in time in the audio signal; a controller configured for analyzing the audio signal and for determining, which portion of the audio signal is the first audio signal portion encoded in the frequency domain and which portion of the audio signal is the second audio signal portion encoded in the time domain; and an encoded signa…