Abstract
A psychoacoustic system, based on a minicomputer (Data General, Nova 1200) is described in which the computer not only controls attenuators and gates but also generates the sinusoidal stimuli by waveform reconstruction. Representative harmonic distortion values for the octave frequencies 125– 8000 Hz (with a digital output rate of 32 000/sec, and eight-bit conversion, and a 16 000-Hz low-pass filter) range from 0.08% to 0.4%, respectively. The psychophysical procedure used involves the random selection of stimulus frequency, undefined random observation intervals, a yes-no response, which is classified into one of eight categories (Hit, Miss, six kinds of False Alarms) with six possible results of each on the up-down adaptive method, on each trial. Despite the rather complex procedure being utilized, use of the direct memory access and interrupt capabilities of the computer result in the processor being idle about 95% of the time. The approach to auditory stimulus generation taken in this system, which minimizes the interfacing and programming attention required for basic stimulus generation, is seen as a powerful aid to many kinds of psychoacoustic research.
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