Method for coding an audio signal

US6424939B1 · kind B1 · utility

Assignee

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

Inventors

• Jürgen Herre · Buckenhof, DE
• Uwe Gbur · Berlin, DE
• Andreas Ehret · Wendelstein, DE
• Martin Dietz · Nuremberg, DE
• Bodo Teichmann · Ergolding, DE
• Oliver Kunz · Seßlach, DE
• Karlheinz Brandenburg · Erlangen, DE
• Heinz Gerhauser · Waischenfeld, DE

Key dates

• Filing date: Oct 6, 1999
• Grant date: Jul 23, 2002
• Expiry date: Oct 6, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/028
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A method for coding or decoding an audio signal combines the advantages of TNS processing and noise substitution. A time-discrete audio signal is initially transformed to the frequency domain in order to obtain spectral values of the temporal audio signal. Subsequently, a prediction of the spectral values in relation to frequency is carried out in order to obtain spectral residual values. Within the spectral residual values, areas are detected encompassing spectral residual values with noise properties. The spectral residual values in the noise areas are noise-substituted, whereupon information concerning the noise areas and noise substitution is incorporated into side information pertaining to a coded audio signal. Thus, considerable bit savings in case of transient signals can be achieved.