Method and a device for coding audio signals and a method and a device for decoding a bit stream

US6502069B1 · kind B1 · utility

Assignee

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

Inventors

• Bernhard Grill · Lautenbächle, DE
• Jürgen Herre · Buckenhof, DE
• Bodo Teichmann · Ergolding, DE
• Karlheinz Brandenburg · Erlangen, DE
• Heinz Gerhauser · Waischenfeld, DE

Key dates

• Filing date: Apr 20, 2000
• Grant date: Dec 31, 2002
• Expiry date: Apr 20, 2020

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B14/046
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

The present invention permits a combination of a scalable audio coder with the TNS technique. In a method for coding time signals sampled in a first sampling rate, second time signals are first generated whose sampling rate is smaller than the first sampling rate. The second time signals are then coded according to a first coding algorithm and written into a bit stream. The coded second time signals are, however, decoded again, and, like the first time signals, transformed into the frequency domain. From a spectral representation of the first time signals, TNS prediction coefficients are calculated. The transformed output signal of the coder/decoder with the first coding algorithm, like the spectral representation of the first time signal, undergoes a prediction over the frequency to obtain residual spectral values for both signals, though only the prediction coefficients calculated on the basis of the first time signals are used. These two signals are evaluated against each other. The evaluated residual spectral values are then coded by means of a second coding algorithm to obtain coded evaluated residual spectral values, which, together with the side information containing the ca…