Noise filling without side information for CELP-like coders

US10984810B2 · kind B2 · utility

Assignee

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

Inventors

• Guillaume Fuchs · Erlangen, DE
• Christian Helmrich · Erlangen, DE
• Manuel Jander · Hemhofen, DE
• Benjamin Schubert · Nuremberg, DE
• Yoshikazu Yokotani · Erlangen, DE

Key dates

• Filing date: Feb 26, 2019
• Grant date: Apr 20, 2021
• Expiry date: Feb 26, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/12
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio decoder provides a decoded audio information on the basis of an encoded audio information including linear prediction coefficients (LPC) and includes a tilt adjuster to adjust a tilt of a noise using linear prediction coefficients of a current frame to acquire a tilt information and a noise inserter configured to add the noise to the current frame in dependence on the tilt information. Another audio decoder includes a noise level estimator to estimate a noise level for a current frame using a linear prediction coefficient of at least one previous frame to acquire a noise level information; and a noise inserter to add a noise to the current frame in dependence on the noise level information provided by the noise level estimator. Thus, side information about a background noise in the bit-stream may be omitted. Methods and computer programs serve a similar purpose.