Method of coding a plurality of audio signals

US5701346A · kind A · utility

Assignee

• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

• Jürgen Herre · Buckenhof, DE
• Berhard Grill · Achern, DE
• Ernst Eberlein · Erlangen, DE
• Karlheinz Brandenburg · Erlangen, DE
• Dieter Seitzer · Erlangen, DE

Key dates

• Filing date: Sep 12, 1996
• Grant date: Dec 23, 1997
• Expiry date: Sep 12, 2016

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S3/02
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

In a method of coding a plurality of audio signals, the left and the right basic channel as well as the central channel are combined by joint stereo coding so as to obtain a jointly coded signal, which is decoded so as to provide simulated decoded signals. The simulated decoded signals and two surround channels are combined by matricization by means of a compatibility matrix so as to form compatible signals which are suitable for decoding by existing decoders. In order to avoid audible disturbances caused by excessive energy contents of the compatible signals, which would occur if joint stereo coding and decoding were carried out prior to carrying out the matricization, the compatible signals or the simulated decoded signals are dynamically weighted by means of a dynamic correction factor in such a way that the compatible signals are approximated with regard to their energy to the energy of signals which would be obtained if the two basic channels and the central channel as well as the surround channels were matricized directly.