Contributor: Joseph D.W.
Stephens, Ph.D., firstname.lastname@example.org
20-member series of morphed VCV and CV acoustic stimuli. Consonants range from /b/ to /d/ or
from /d/ to /g/, in one of four vowel context: /i/, /ć/, /a/ or
/u/. The stimuli were created by
adjusting filter parameters of natural utterances derived from LPC
analysis and applying the adjusted filters to source waveforms
extracted from the natural tokens.
The archives below contain acoustic stimuli for use in speech
perception research. The stimuli
and the methods used to create them are described in more detail in Stephens, J.D.W., &
Holt, L.L. (2011). A standard set of American-English voiced stop consonant stimuli from morphed natural speech. Speech Communication, 53, 877-888.
Please cite the paper when using the stimuli.
stimuli are free to use for academic research and educational purposes.
For all other uses, please obtain permission from either Dr. Stephens or Dr. Holt.
available for download:
The files named VCV_stimuli.zip and CV_stimuli.zip each contain
eight 20-member morphed series, arranged hierarchically within
The directories corresponding to each vowel in VCV_stimuli.zip
also include the original recorded utterances as well as the edited
versions of the recordings and source waveforms used as input in the
The file named all_stimuli.zip contains
all 320 stimuli and associated files within a single directory.
The file named formant_frequencies.pdf
contains the table of measured formant frequencies given in Appendix B
of the paper.
Researchers are advised to refer to the paper cited above and to the
online documentation for important information regarding the acoustic
and perceptual properties of the stimuli. The stimuli may also be
obtained via electronic mail (email@example.com)
or in CD format by postal mail addressed to Lori Holt, Psychology
Department, 5000 Forbes
Ave., Pittsburgh, PA 15213.