A new experimentation set-up for psychoacoustic research

A new IEEE-488 controlled experimentation set-op for psychoacoustic research was put into use. Three devices of this set-up were our own developments, si nce there were no suitable olles colllmercially available. The 'Parallel Timers' and the 'Fourth-dB Attenuators' were developed to manipulate the stimuli present. ed to the subjects. The first device is a set. of four timer modules which produce programmable pldses to an accuracy of 0.1ms. They are used to enable and disable audio switches and control events ill the stimulus presentatio n. The 'Fourth dB Attenuaton!' are used for a programmable attenuation of stimuli in 0.25dB steps to an accuracy of 0.1dB. Another part of the set-up is the 'Reaction Recorder'. This is a device to collect reactions, as well as reaction times, from subjects. A maximum of eight subjects can be handled by one recorder.