Below is the vowel database that we created for our study on the learnability of vowels in infant-directed speech (Adriaans & Swingley, 2017). Details about the data can be found in the paper:
Adriaans, F., & Swingley, D. (2017). Prosodic exaggeration within infant-directed speech: Consequences for vowel learnability. The Journal of the Acoustical Society of America, 141 (5), 3070-3078. DOI: http://dx.doi.org/10.1121/1.4982246 [.pdf]
Please cite the above paper when using our data set.