ABSTRACT

The AAMP/APH results are presented in Figure 1c. The solid line (open squares) shows 9-dB AAMP data replotted from Figure 1a as the appropriate comparison. The upper two curves show the data for sounds where the odd harmonics are attenuated 9 dB and the same components are phase shifted either 60 degrees (open triangles) or 90 degrees (frilled triangles). In this case we see the expected effects. Both phase shifts raise tone height for octaves below 400 Hz and not above, and the 90 degree phase shift has more effect than the 60 degree shift. It seems likely that the elevation of the CPH responses to sounds at octaves three and four limits our ability to measure a phase effect when there is no attenuation of the odd harmonics.