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. Author manuscript; available in PMC: 2010 Feb 26.
Published in final edited form as: Atten Percept Psychophys. 2010 Feb;72(2):470–480. doi: 10.3758/APP.72.2.470

Figure 2.

Figure 2

Plots denoting the generation of spectral envelope difference filters. (A) Power spectral envelope of the French horn endpoint. (B) Power spectral envelope of the tenor saxophone endpoint. Envelopes were obtained using 512-point fast Fourier transforms, smoothed with 256-point Hamming windows with 50% overlap. (C) Smoothed spectral envelope difference filter response of the French horn spectral envelope minus the saxophone spectral envelope. With negligible energy in the French horn above 5 kHz, relative gain of the filter above this point is negative. (D) Smoothed difference filter response of the saxophone spectral envelope minus the French horn envelope. The filter response in panel D is approximately the inverse of the filter response shown in panel C.