Audio encoder and decoder for encoding frames of sampled audio signals

US8751246B2 · kind B2 · utility

Assignees

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

Inventors

• Jérémie Lecomte · Santa Clara, US
• Philippe Gournay · Sherbrooke, CA
• Stefan Bayer · Nuremberg, DE
• Markus Multrus · Nuremberg, DE
• Nikolaus Rettelbach · Nuremberg, DE

Key dates

• Filing date: Jan 11, 2011
• Grant date: Jun 10, 2014
• Expiry date: Jul 24, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/20
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio encoder adapted for encoding frames of a sampled audio signal to obtain encoded frames, wherein a frame has a number of time domain audio samples, having a predictive coding analysis stage for determining information on coefficients of a synthesis filter and information on a prediction domain frame based on a frame of audio samples. The audio encoder further has a frequency domain transformer for transforming a frame of audio samples to the frequency domain to obtain a frame spectrum and an encoding domain decider for deciding whether encoded data for a frame is based on the information on the coefficients and on the information on the prediction domain frame, or based on the frame spectrum. Moreover, the audio encoder has a controller for determining an information on a switching coefficient when the encoding domain decider decides that encoded data of a current frame is based on the information on the coefficients and the information on the prediction domain frame when encoded data of a previous frame was encoded based on a previous frame spectrum and a redundancy reducing encoder for encoding the information on the prediction domain frame, the information on the coeffic…