Audio signal encoder, audio signal decoder, method for encoding or decoding an audio signal using an aliasing-cancellation

US8484038B2 · kind B2 · utility

Assignees

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE
• VOICEAGE CORPORATION · CA
• KONINKLIJKE PHILIPS ELECTRONICS NV · NL
• Dolby International AB · IE

Inventors

• Bruno Bessette · Sherbrooke, CA
• Max Neuendorf · Nuremberg, DE
• Ralf Geiger · Erlangen, DE
• Philippe Gournay · Sherbrooke, CA
• Roch Lefebvre · Magog, CA
• Bernhard Grill · Lautenbächle, DE
• Jérémie Lecomte · Santa Clara, US
• Stefan Bayer · Nuremberg, DE
• Nikolaus Rettelbach · Nuremberg, DE
• Lars Villemoes · Stockholm, SE
• Redwan Salami · Delta, CA
• Albertus Cornelis Den Brinker · Eindhoven, NL

Key dates

• Filing date: Apr 18, 2012
• Grant date: Jul 9, 2013
• Expiry date: Apr 18, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L2019/0008
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio signal decoder includes a transform domain path configured to obtain a time-domain representation of a portion of an audio content on the basis of a first set of spectral coefficients, a representation of an aliasing-cancellation stimulus signal and a plurality of linear-prediction-domain parameters. The transform domain path applies a spectrum shaping to the first set of spectral coefficients to obtain a spectrally-shaped version thereof. The transform domain path obtains a time-domain representation of the audio content on the basis of the spectrally-shaped version of the first set of spectral coefficients. The transform domain path includes an aliasing-cancellation stimulus filter to filter the aliasing-cancellation stimulus signal in dependence on at least a subset of the linear-prediction-domain parameters. The transform domain path also includes a combiner configured to combine the time-domain representation of the audio content with an aliasing-cancellation synthesis signal to obtain an aliasing reduced time-domain signal.