Digital adaptive transformation coding method

US5742735A · kind A · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Ernst Eberlein · Erlangen, DE
• Heinz Gerhauser · Waischenfeld, DE
• Harald Popp · Tuchenbach, DE
• Dieter Seitzer · Erlangen, DE
• Hartmut Schott · Erlangen, DE
• Karl-Heinz Brandenburg · Erlangen, DE

Key dates

• Filing date: Aug 25, 1994
• Grant date: Apr 21, 1998
• Expiry date: Aug 25, 2014

Classification

• Technology area (CPC G): Physics
• CPC primary: G10H2250/235
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A digital adaptive transformation coding method for the transmission and/or torage of audio signals, specifically music signals, wherein N scanned values of the audio signal are transformed into M spectral coefficients, and the coefficients are split up into frequency groups, quantized and then coded. The quantized maximum value of each frequency group is used to define the coarse variation of the spectrum. The same number of bits is assigned to all values in a frequency group. The bits are assigned to the individual frequency groups as a function of the quantized maximum value present in the particular frequency group. A multi-signal processor system is disclosed which is specifically designed for implementation of this method.