DEVICE FOR MONITORING ACOUSTIC SIGNAL PROCESSING SYSTEMS

PCT No. PCT/DE89/00110 Sec. 371 Date Oct. 25, 1989 Sec. 102(e) Date Oct. 25, 1989 PCT Filed Feb. 25, 1989 PCT Pub. No. WO89/08357 PCT Pub. Date Sep. 8, 1989.Disclosed is an apparatus for checking audio signal processing systems. The apparatus has the following features: 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. 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, 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, 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, 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.