Prof. Baglione & Graduate Student Michael Pimpinella Co-author Journal of Voice Paper

POSTED ON: April 2, 2017

Inside Cooper's anechoic chamber

Inside Cooper's anechoic chamber

Prof. Melody Baglione (Mechanical Engineering) and graduate student Michael Pimpinella are co-authors of a publication titled "Mobile Digital Recording: Adequacy of the iRig™ and iOS device for Acoustic and Perceptual Analysis of Normal Voice" in the Journal of Voice, Vol. 31, Issue 2, 236-242.


Objective: The purpose of this study is to determine whether the iRig™ and iOS device recording system is comparable to a standard computer recording system for digital recording of normal voices. Methods: 37 vocally healthy adults, aged between 20 and 62 years, mean age of 33.9 years, 13 males and 24 females, participated in the study. Eighteen subjects were recorded with the iPhone and 19 with the iPad. Recordings were simultaneously digitalized in an iPad and iPhone using a unidirectional condenser microphone for smartphones and tablets (iRig™ Mic, IK Multimedia) and in a computer laptop (Dell-Inspiron) using a unidirectional condenser microphone (Samson-CL5) connected to a preamplifier with phantom power. Both microphones were placed on stands and lined up at an equal fixed distance of 30 cm from the subject’s mouth. Speech tasks consisted of a sustained vowel “ah” at comfortable pitch and loudness, counting from 1-10, and a glissando “ah” from a low to a high note. The samples captured on the iOS devices were transferred via SoundCloud in a wav format. Samples from both devices were analyzed using the Praat software. The acoustic parameters measured were mean, min and max F0, SD F0, jitter local, jitter rap, jitter ppq5, jitter ddp, shimmer local, shimmer local-dB, shimmer apq3, shimmer apq5, shimmer apq11, shimmer dda, NHR and HNR. Results: There were no statistically significant differences for any parameter and speech task analyzed for both the iPad and iPhone results as compared to the measures obtain by the gold standard computer/preamp system (all p values>0.050). In addition, there were no statistical differences in the perceptual identification of the recordings among the different devices (p<0.001). Conclusion: In this study, the iRig™ and iOS device can possibly provide reliable digital recording of normal voices.

  • Founded by inventor, industrialist and philanthropist Peter Cooper in 1859, The Cooper Union for the Advancement of Science and Art offers education in art, architecture and engineering, as well as courses in the humanities and social sciences.

  • “My feelings, my desires, my hopes, embrace humanity throughout the world,” Peter Cooper proclaimed in a speech in 1853. He looked forward to a time when, “knowledge shall cover the earth as waters cover the great deep.”

  • From its beginnings, Cooper Union was a unique institution, dedicated to founder Peter Cooper's proposition that education is the key not only to personal prosperity but to civic virtue and harmony.

  • Peter Cooper wanted his graduates to acquire the technical mastery and entrepreneurial skills, enrich their intellects and spark their creativity, and develop a sense of social justice that would translate into action.