다채널보청기의 압축 방식에 따른 문장인지도와 선호도의 비교

서지정보

· 발행기관 : 한국청각언어재활학회
· 수록지 정보 : 청능재활 / 13권 / 1호
· 저자명 : 신수연, 이경원

목차

INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSIONS
REFERENCES

초록

현재 보청기의 기술은 디지털 기술의 접목으로 난청인의 의
사소통 능력의 개선에 많은 도움을 주고 있다. 최근까지의 보청
기의 기술을 간략히 살펴보면 채널 수의 증가, 음향피드백, 폐
쇄효과, 잡음 등의 효과적인 제어, 난청인이 듣기 힘든 고주파
수 대역의 정보를 잔존청력이 남아 있는 주파수 대역에서 듣게
하는 주파수하강(frequency lowering), 양측에 착용한 보청기
의 정보를 서로 교환하여 신호를 처리하는 양이통신 등이 있다
(Bohnert et al., 2010; Glista et al., 2009; Lee, 2014). 그러나 보
청기의 기술이 발전했음에도 불구하고 내이의 손상으로 인해
역동범위가 감소한 감각신경성난청인에게 보청기를 적합할 경
우에는 상기의 보청기 기술과 아울러 비선형의 증폭 특성 및
조절 방식에 대한 이해가 필요하다.

영어초록

Purpose: The aims of this study were to investigate the sentence recognition score (SRS), clarity of speech sounds, perception of changes
in the background noise and differences in the overall preference according to the compression types in a multi-channel hearing aid.
Methods: 19 subjects (21 ears) with moderate to severe sensorineural hearing loss (SNHL) participated in this study. The compression
methods of hearing aids were adjusted to implement the base increase at low level (BILL), treble increase at low level (TILL), and Multichannel
compression (MCC), and the compression ratio in these cases was 2 : 1. After varying the compression methods of the hearing
aid according to the frequency band, the SRS, clarity of speech sounds, perception of changes in the background noise, and overall preference
for the sound quality were investigated in a quiet, 6 dB and 0 dB signal-to-noise ratios (SNRs). Results: For SRS, scores of MCC
were higher than those of either BILL or TILL in the case of a quiet and 6 dB SNR, and no difference in SRS was found between BILL and
TILL. In the subjective evaluation, MCC and BILL were found to have higher scores than TILL, while there was no difference between BILL
and MCC. Conclusion: This study confirmed that for Korean with SNHL, it was effective in terms of the SRS or clarity of speech sounds
to implement compression for all frequencies. However, it is considered necessary to conduct further research upon the effective compression
ratio and compression threshold according to the hearing threshold level for adequate electroacoustic adjustment of hearing aids for
Korean with hearing impairment.

참고자료

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