Method for measuring the conservation of stereophonic audio signals and method for identifying jointly coded stereophonic audio signals

US5926553A · kind A · utility

Assignee

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

Inventors

• Michael Keyhl · Heroldsbach, DE
• Jürgen Herre · Buckenhof, DE
• Christian Schmidmer · Nuremberg, DE
• Karlheinz Brandenburg · Erlangen, DE
• Dieter Seitzer · Erlangen, DE

Key dates

• Filing date: Jul 21, 1997
• Grant date: Jul 20, 1999
• Expiry date: Jul 21, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S7/00
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Jointly processed stereophonic audio signal properties are identified using a stereophonic signal as reference signal and creating a signal for testing by processing the stereophonic signal, e.g. by coding and subsequently decoding it. Both signals are transformed into the frequency domain to create representative spectral data for the respective subbands. Correlation coefficients are determined for each subband both of the reference signal and also of the signal for testing on the basis of the spectral data of the channels of the reference signal or of the signal for testing. From the comparison of the correlation coefficients belonging to the same subband, jointly processed stereophonic audio signals are detected if at least one of the correlation coefficients of the signal for testing greatly exceeds the correlation coefficient of the reference signal for the same subband.