Envelope shaping of decorrelated signals

US7983424B2 · kind B2 · utility

Assignees

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE
• Coding Technologies AB · SE

Inventors

• Kristofer Kjorling · Solna, SE
• Jürgen Herre · Buckenhof, DE
• Sascha Disch · Bad Mergentheim, DE
• Lars Villemoes · Stockholm, SE

Key dates

• Filing date: Apr 12, 2006
• Grant date: Jul 19, 2011
• Expiry date: May 19, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S2420/03
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

The envelope of a decorrelated signal derived from an original signal can be shaped without introducing additional distortion, when a spectral flattener is used to spectrally flatten the spectrum of the decorrelated signal and the original signal prior to using the flattened spectra for deriving a gain factor describing the energy distribution between the flattened spectra, and when the so derived gain factor is used by an envelope shaper to timely shape the envelope of the decorrelated signal.