시간-주파수 변환 압축에 따른 정상 성인의 한국어 단음절 숫자 인지 기능

서지정보

ㆍ발행기관 : 한국청각언어재활학회 ㆍ수록지정보 : 청능재활 / 8권 / 2호
ㆍ저자명 : 임덕환, 원유경

목차

INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSIONS AND CONCLUSIONS

영어 초록

There have been constant demands on effective compression schemes for speech signals in both clinical and commercial applications.
The effects of these strategies on word recognition tasks appeared to be dependent on the implemented algorithm of the compression,
the features of the speech, and the properties of the auditory processing system. It, therefore, is necessary to evaluate the effects of
compression schemes on individual languages. However, the related standard data for Korean words were limited in number and this
might lead to the inadequate application of the particular compression scheme. In this study, the properties of a typical time-frequency
altered compression scheme were analyzed for Korean quintet monosyllabic digit sets in normal hearing young adults. The
representative basic compression scheme was based on the time-frequency altered compression preserving no particular traits (PNT)
in spectro-temporal domain. Twenty normal hearing young adult subjects (10 males, 10 females) were evaluated for this scheme with
the predetermined compression ratios of 1 (no compression), 0.71, 0.5, 0.33, and 0.25. These randomized quintet stimuli were
presented to the subjects through acoustically calibrated insert earphones in a custom-made auditory workstation. The results showed
rapid deterioration of performance for the corresponding high compression ratios. No statistically significant differences were
observed for male and female subjects in the outcomes of the five compression ratios (p > 0.05). In the response profile of PNT, the
estimated compression ratio for 50% performance was about 0.44. In summary, a typical time-frequency altered compression scheme
(PNT) showed a poor performance near the point where the amount of compression was doubled. This, however, may not indicate the
same results for optimized time-frequency features. Thus, profiles of individual compression schemes need to be clinically evaluated
and compared for their efficiency and effectiveness.

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