A Cepstral Peak Prominence (CPP) Voice Analysis in Iranian Post-lingual Deaf Adult Cochlear Implant Users

Published:November 29, 2021DOI:https://doi.org/10.1016/j.jvoice.2021.10.021

      Summary

      Objective

      In standardized connected speech samples, cepstral peak prominence (CPP) and smoothed CPP (CPPS) have been described as accurate parameters to evaluate voice quality. Lack of normal auditory feedback in post-lingually deaf CI users might influence tuning the acoustic parameters in speech production. Based on shreds of evidence, normal hearing results in suitable vocal control through the sensory-motor linkage. The main aim of the present study was to compare the cepstral values between the Iranian cochlear implant group and normal peers.

      Method

      Persian CAPE-V sentences were recorded from 30 CI users and 30 healthy speakers (mean age=36.7 years, SD=13.5, range=18-60 years). Thirteen /a/vowels were extracted manually from syllables. Each subject phonated sustained /a/vowel for 5 seconds. PRAAT was used to calculate CPP and CPPS. To compare two age- and gender-matched groups, the independent sample t-test was applied. Then, ANCOVA was used to assess the impact of demographic factors on cepstral scores in CI participants.

      Results

      Significant differences between the CI group and normal peers were discovered based on CPP and CPPS in both tasks (reading sentences and sustained vowel) (P < 0.05). Overall, CI users showed higher cepstral values. The implanted ear and prosthesis model had no significant impact on both CPP and CPPS (P ≥ 0.8).

      Conclusion

      Higher CPP and CPPS values in the CI users might be due to increased phonatory instability and spectral noise, with the possibility of decreased vocal control and its quality. The outcome suggests that CI group uses a different voice control strategy. These findings should be kept in mind for intervention methods, especially by assessing vocal characteristics and considering the voice quality in adult CI users.

      Key Words

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