Audio coder/decoder with predictive coding of synthesis filter and critically-sampled time aliasing of prediction domain frames

US8595019B2 · kind B2 · utility

Assignees

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

Inventors

• Ralf Geiger · Erlangen, DE
• Bernhard Grill · Lautenbächle, DE
• Bruno Bessette · Sherbrooke, CA
• Philippe Gournay · Sherbrooke, CA
• Guillaume Fuchs · Erlangen, DE
• Markus Multrus · Nuremberg, DE
• Max Neuendorf · Nuremberg, DE
• Gerald Schuller · Erfurt, DE

Key dates

• Filing date: Jan 11, 2011
• Grant date: Nov 26, 2013
• Expiry date: Oct 20, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/04
• 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 includes a number of time domain audio samples. The audio encoder includes a predictive coding analysis stage for determining information on coefficients of a synthesis filter and a prediction domain frame based on a frame of audio samples. The audio encoder further includes a time-aliasing introducing transformer for transforming overlapping prediction domain frames to the frequency domain to obtain prediction domain frame spectra, wherein the time-aliasing introducing transformer is adapted for transforming the overlapping prediction domain frames in a critically-sampled way. Moreover, the audio encoder includes a redundancy reducing encoder for encoding the prediction domain frame spectra to obtain the encoded frames based on the coefficients and the encoded prediction domain frame spectra.