Søren Buus did his MSc at the Acoustics Laboratory, Technical University of Denmark (DTU), in 1975 on the topic headphone calibration. He showed the importance of reliable reference values for psychoacoustic research and Søren was a great inspiration for my work (Scand. Audiol. 20, 205–207 (1991); 27, 105–112 (1998)). Already from the seventies, temporal integration of loudness has been a major topic in the collaboration with Søren (Buus et al., J. Acoust. Soc. Am. 105, 3464–3480 (1999)) and the measurements of temporal integration over a wide range of presentation levels led to the important finding about the shape of the loudness function (Buus et al., J. Acoust. Soc. Am. 100, 669–680 (1997)). Søren talked about the importance of the psychophysical procedure and the influence from the procedure on the results (Buus, Proceedings 19th Danavox Symposium (2001), pp. 183–226). The goal was to
obtain reliable, unbiased, and precise results. An overview of some of the above investigations will be presented together with recent results from a MSc project on headphone calibration of short duration sounds for ABR measurements.
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