| Summary: | The present study aims to investigate the number of voice sample production
trials required to obtain reliable measurement of acoustic parameters i.e., fundamental
frequency, jitter percent, shimmer percent, and harmonic-to-noise ratio. Based on a
convenient sampling, a total of 33 males participants were recruited in the present
study. Each participant was required to produce sustained vowel /a/ in comfortable pitch
and loudness for at least 5 seconds for 15 trials. These voice samples were objectively
analyzed to obtain the acoustic parameters of voice. The Intraclass Correlation
Coefficients (ICCs) values of 3 to 15 trials for each acoustic parameters were measured
to determine the number of trials of voice sample production that produce reliable
measurement of acoustic parameters.
The finding of the present study demonstrated three voice sample production
trials were required to obtain both acceptable and excellent reliability measurement for
fundamental frequency, shimmer percent and harmonic-to-noise ratio. For jitter percent,
at least four trials of voice sample production were required to obtain acceptable
reliability and at least seven trials of voice sample production to acquire excellent
reliability measurement. Based on the present study, it is recommended that a minimum
of four trials of voice sample production are required to obtain at least acceptable
reliability measurement for all acoustic parameters.
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