Apparatus for checking audio signal processing systems

US5014318A · kind A · utility

Assignee

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

Inventors

• Hartmut Schott · Erlangen, DE
• Dieter Seitzer · Erlangen, DE
• Heinz Gerhauser · Waischenfeld, DE
• Karlheinz Brandenburg · Erlangen, DE
• Ernst Eberlein · Erlangen, DE
• Stefan Krägeloh · Erlangen, DE
• Rolf Kapust · Erlangen, DE
• Harald Popp · Tuchenbach, DE

Key dates

• Filing date: Oct 25, 1989
• Grant date: May 7, 1991
• Expiry date: Oct 25, 2009

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B14/04
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Disclosed is an apparatus for checking audio signal processing systems. The apparatus has the following features: PA0 the apparatus is provided with a first input connection, to which the input signal of the audio processing system to be checked is transmitted, a second input connection, to which the output signal of said system is transmitted, and a signal processor. PA0 said signal processor ascertains the signal delay time of said system to be checked by means of correlating said signals received at said two input connections, PA0 said signal processor always composes the difference signal from said signal received at said first input connection during a specific time span and said signal received at said second input connection, lagging by the signal delay time, PA0 said signal processor ascertains the spectral composition of said signal received at said first input connection during said specific time span and of said respective difference signal, PA0 said signal processor ascertains the hearing threshold of the human ear from said spectral composition and compares the ascertained hearing threshold with the respective difference signal.