Apparatus and method for generating audio subband values and apparatus and method for generating time-domain audio samples

US8438015B2 · kind B2 · utility

Assignee

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

Inventors

• Markus Schnell · Nuremberg, DE
• Manfred Lutzky · Nuremberg, DE
• Markus Lohwasser · Hersbruck, DE
• Markus Schmidt · Seibersbach, DE
• Marc Gayer · Erlangen, DE
• Michael Mellar · Ludwigshafen, DE
• Bernd Edler · Hannover, DE
• Markus Multrus · Nuremberg, DE
• Gerald Schuller · Erfurt, DE
• Ralf Geiger · Erlangen, DE
• Bernhard Grill · Lautenbächle, DE

Key dates

• Filing date: Oct 23, 2007
• Grant date: May 7, 2013
• Expiry date: Oct 13, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L21/038
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An embodiment of an apparatus for generating audio subband values in audio subband channels includes an analysis windower for windowing a frame of time-domain audio input samples being in a time sequence extending from an early sample to a later sample using an analysis window function including a sequence of window coefficients to obtain windowed samples. The analysis window function includes a first number of window coefficients derived from a larger window function including a sequence of a larger second number of window coefficients, wherein the window coefficients of the window function are derived by an interpolation of window coefficients of the larger window function. The apparatus further includes a calculator for calculating the audio subband values using the windowed samples.