Acoustic analysis of hoarseness utilizing sound spectrograph: Measurement of pitch perturbation.:Measurement of Pitch Perturbation

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Pitch perturbation in the sustained phonation /a/ was analyzed by use of a sound spectrograph (Digital Sonagraph Model 7800, Kay Elemetrics Corp.) . The extent of pitch fluctuation of a phonatory sample was measured on the highest harmonic strips of a sound spectrogram (0-2 kHz range & 11.3 Hz filter width) . Two other indices were obtained through a minicomputer system : maximum pick fluctuation (ΔF), comparable to the value measued by the sound spectrogram, and cycle-to-cycle pitch perturbation (F) . The subjects consisted of 20 normal and 30 pathological cases with varying degrees of hoarseness. The values measured by sound spectrogram of the pathological voices had a significant correlation with ΔF and F (p<0.01) . The values measured by sound spectrogram of the normal voices ranged from 1.7% to 4.8% with a mean of 2.7. %We estimated that 95% of the normal subjects have a value smaller than 4.2%. According to this criterion with a 5% false alarm rate, 73.3% of the pathological phonatory samples were differentiated from normal samples. In the same fashion, each ΔF and F detected 76.7%. of the pathological samples from normals. These results showed that the extent of pitch fluctuation obtained from a sound spectrogram was a reliable and clinically useful index.
日本音声言語医学会の論文