[Acoustic analysis in different background of hearing].
OBJECTIVE
To find out the changes of voice in different noisy background by computer acoustic analysis.


METHODS
Twenty-five young people who got normal hearing level and normal vocal cords were selected. They were tested after trained. Sustained /a/,/i/ and sentences were recorded in the three different background: quite, white band noise and speech noise. The software of MDVP was used. Testing parameters included: F0, Jitter, Shimmer, APQ, PPQ, HNR.


RESULTS
Fundamental frequencies of noisy groups are significantly higher in male-/a/, female-/a/ and female-/i/ groups. The perturbations are not significantly different among them. The HNR is negatively relative with F0.


CONCLUSIONS
Normal hearing persons increase their fundamental frequencies in the noisy surroundings.
Liu
Yun
Y
Department of Otolaryngology, Beijing Friendship Hospital, Capital University of Medical Sciences, Beijing 100050.
Zhang
Daoxing
D
Liu
Yongxiang
Y
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D009622:Noise / Q000009:adverse effects*; D013068:Speech Production Measurement; D014831:Voice / Q000502:physiology*