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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: Hear Res. 2013 Sep 12;305:10.1016/j.heares.2013.08.017. doi: 10.1016/j.heares.2013.08.017

Figure 5.

Figure 5

The envelope spectrum of natural speech production. a) Houtgast and Steeneken (1973): “The fluctuations of running speech as represented by the envelope spectrum.” b) Plomp et al. (1984): Average envelope spectrum for 1-min discourses from 10 male speakers. c) Ohala (1975): Jaw opening intervals during continuous speech. The majority of intervals occur in the range ~200-500 ms (i.e., ~2-5 Hz) and almost all intervals (other than small motion noise discussed by the author) occur in the range ~100-1000 ms (~1-10 Hz).