This paper presents the results of the third part of an experiment aimed to determine discrimination thresholds for timbre of pink noise modified by a formant. The investigated parameter was the Q factor (Q=f/?f). The Q=3 was used as a reference and the comparison stimuli had Q>3. A 3AFC test paradigm was used. The listeners, who were tonmeisters and non-musicians, were asked to indicate which noise burst in each group of three was a different one. The results indicate that: (1) the Q discrimination threshold as a function of formant frequency has a U shape, (2) tonmeisters better discriminate Q changes than non-musicians, and (3) all listeners improved their scores with practice. Above results are consistent with those reported previously.
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