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A Psychophysical Investigation of the Frequency-warping Coefficient (Lambda)

The effect of varying the frequency-warping coefficient (lambda) on localisation and discrimination performance was investigated in two experiments. Cochlear modeling was also conducted to investigate the difference between cochlear output for warped and linear frequency stimuli. Both methods suggest that lambda values greater than 0.65 are not optimal for auditory applications. The optimal lambda values found using these methods (0.47, 0.55 and 0.24 for localisation, discrimination and cochlear modeling, respectively) are lower than the value that best fits the Bark scale (0.77). It is recommended that optimal lambda values be determined by psychophysical evaluation.

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