Abstract
The interesting aspect of this study is the use of a spectral ripple on a log‐f scale. The computer‐generated stimuli consist, basically, of 160 frequency components added in random phase, separated by 1/40‐octave intervals and covering the range of 250 to 4000 Hz. In a forced choice procedure, the reference stimulus had a flat spectral envelope (level of each component Lf = const.), whereas the spectral envelope of the target stimulus was slightly modulated according to Lf = const. + d sin (2π n log f/log 2). The parameter n indicates the number of ripples per octave, whereas d was treated as the dependent variable in an adaptive 2‐AFC measuring procedure. It is found that the just‐detectible peak‐to‐valley ratio shows a distinct minimum for about two ripples per octave. This result agrees well with the concept of an auditory filter shape with a suppression area which is located about a factor 1.2 above the filter's nominal frequency.
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