Coding and decoding of audio signals by using intensity stereo and prediction processes

US6341165B1 · kind B1 · utility

Assignees

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE
• AT&T Laboratories/Research · US
• Lucent Technologies, Bell Laboratories · US

Inventors

• Uwe Gbur · Berlin, DE
• Martin Dietz · Nuremberg, DE
• Karlheinz Brandenburg · Erlangen, DE
• Heinz Gerhauser · Waischenfeld, DE
• Jürgen Herre · Buckenhof, DE
• Schuyler Reynier Quackenbush · Westfield, US

Key dates

• Filing date: May 28, 1999
• Grant date: Jan 22, 2002
• Expiry date: May 28, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/04
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

In the coding and decoding of stereo audio spectral values both the intensity stereo process and prediction are used in order to achieve high data compression. If intensity stereo coding is active in one section of scale factor bands, the prediction for the right channel in that range is deactivated, whereby the results of the prediction are not used to form the coded stereo audio spectral values. To allow further adaptation of the prediction for the right channel, the predictor of the right channel is fed with stereo audio spectral values for the channel, which again are intensity stereo decoded.