Apparatus and method for encoding or decoding an audio signal using a transient-location dependent overlap

US9947329B2 · kind B2 · utility

Assignee

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

Inventors

• Christian Helmrich · Erlangen, DE
• Jérémie Lecomte · Santa Clara, US
• Goran Markovic · Nuremberg, DE
• Markus Schnell · Nuremberg, DE
• Bernd Edler · Hannover, DE
• Stefan Reuschl · Nuremberg, DE

Key dates

• Filing date: Aug 19, 2015
• Grant date: Apr 17, 2018
• Expiry date: Nov 1, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N19/44
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for encoding an audio or image signal, includes: a controllable windower for windowing the audio or image signal to provide the sequence of blocks of windowed samples; a converter for converting the sequence of blocks of windowed samples into a spectral representation including a sequence of frames of spectral values; a transient location detector for identifying a location of a transient within a transient look-ahead region of a frame; and a controller for controlling the controllable windower to apply a specific window having a specified overlap length to the audio or image signal in response to an identified location of the transient, wherein the controller is configured to select the specific window from a group of at least three windows, wherein the specific window is selected based on the transient location.