Apparatus and method for encoding and decoding an audio signal using an aligned look-ahead portion

US9047859B2 · kind B2 · utility

Assignee

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

Inventors

• Emmanuel Ravelli · Erlangen, DE
• Ralf Geiger · Erlangen, DE
• Markus Schnell · Nuremberg, DE
• Guillaume Fuchs · Erlangen, DE
• Vesa Ruoppila · Nuremberg, DE
• Tom Baeckstroem · Nuremberg, DE
• Bernhard Grill · Lautenbächle, DE
• Christian Helmrich · Erlangen, DE

Key dates

• Filing date: Aug 14, 2013
• Grant date: Jun 2, 2015
• Expiry date: Aug 14, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L25/06
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for encoding an audio signal having a stream of audio samples has: a windower for applying a prediction coding analysis window to the stream of audio samples to obtain windowed data for a prediction analysis and for applying a transform coding analysis window to the stream of audio samples to obtain windowed data for a transform analysis, wherein the transform coding analysis window is associated with audio samples within a current frame of audio samples and with audio samples of a predefined portion of a future frame of audio samples being a transform-coding look-ahead portion, wherein the prediction coding analysis window is associated with at least the portion of the audio samples of the current frame and with audio samples of a predefined portion of the future frame being a prediction coding look-ahead portion, wherein the transform coding look-ahead portion and the prediction coding look-ahead portion are identically to each other or are different from each other by less than 20%; and an encoding processor for generating prediction coded data or for generating transform coded data.