Encoder for encoding an audio signal, audio transmission system and method for determining correction values

US9818420B2 · kind B2 · utility

Assignee

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

Inventors

• Konstantin Schmidt · Nuremberg, DE
• Guillaume Fuchs · Erlangen, DE
• Matthias Neusinger · Meiningen, DE
• Martin Dietz · Nuremberg, DE

Key dates

• Filing date: May 5, 2016
• Grant date: Nov 14, 2017
• Expiry date: May 5, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/06
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An encoder for encoding an audio signal includes an analyzer for analyzing the audio signal and for determining analysis prediction coefficients from the audio signal. The encoder includes a converter for deriving converted prediction coefficients from the analysis prediction coefficients, a memory for storing a multitude of correction values and a calculator. The calculator includes a processor for processing the converted prediction coefficients to obtain spectral weighting factors. The calculator includes a combiner for combining the spectral weighting factors and the multitude of correction values to obtain corrected weighting factors. A quantizer of the calculator is configured for quantizing the converted prediction coefficients using the corrected weighting factors to obtain a quantized representation of the converted prediction coefficients. The encoder includes a bitstream former for forming an output signal based on the quantized representation of the converted prediction coefficients and based on the audio signal.