Selection and Training of Subjects for Listening Tests on Sound-Reproducing Equipment
The correlation between the subjects' ability to repeat ratings of the same stimulus and their hearing threshold level and degree of previous experience in listening tests is examined. The variance of repeated ratings of the same stimulus is used as a measure of the subjects' performance in listening tests. The loudspeaker test statistic is examined as an alternative to the error variance. The effects of training experiments are investigated and finally an example of the selection of a group of subjects based on the measures discussed is given. The study is based on the results of a series of listening tests in which 12 subjects participated in six listening tests each. In each test four loudspeakers were evaluated by means of four programs using a paired-comparison procedure and ratings on an interval rating scale of 0 to 10.
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