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. Author manuscript; available in PMC: 2019 Jun 1.
Published in final edited form as: Res Dev Disabil. 2018 May 1;77:98–113. doi: 10.1016/j.ridd.2018.04.014

FIGURE 1.

FIGURE 1

Spectral envelope showing individual harmonics in one pitch period, before processing (black line) and after processing (blue line). The red line shows the mean spectral slope. (Reprinted from Nittrouer et al., 2015)