측정 절차가 건청인의 한국어 Matrix 소음하 문장인지에 미치는 영향
Influence of Measurement Procedure on the Korean Matrix Sentence-in-Noise Intelligibility for Normal-Hearing Listeners
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초록
Background and Objectives A Korean Matrix Sentence Test is one of the adaptive testsused to evaluate speech intelligibility in noise. The present study aimed to investigate the influenceof measurement procedure (presentation level and mode) on the Korean matrix sentence-in-noise intelligibility of normal-hearing listeners. Subjects and Method Twenty-seven normal-hearing adults participated in the study. Thespeech reception threshold (SRT) was determined using a software-based adaptive procedure,which converges on the signal-to-noise ratio (SNR), corresponding to 50% intelligibility. Thespeech or speech-shaped noise was given at three presentation levels based on the previouscategorical loudness judgments (between soft and medium: 55 dB SPL, medium: 65 dB SPL,and loud level: 80 dB SPL). The effect of the presentation mode was explored by fixing eitherthe sentence level or noise level, while the noise or sentence level was adaptively adjusted accordingto the subject’s response. Results The presentation level significantly affected the SRTs, whereas the SRTs did not dependon the presentation mode. The sentence-in-noise intelligibility was similar between 55and 65 dB SPL, yet the sentence-in-noise intelligibility significantly decreased at 80 dB SPLregardless of the presentation mode. Correlation analyses showed moderate to high positivecorrelations among the results of two presentation modes. Conclusion A presentation level of 55 or 65 dB SPL yielded comparable adaptive measurementresults for normal-hearing subjects, yet the sentence-in-nose intelligibility became worseat 80 dB SPL. Clinicians should be careful with the influence of the presentation level whenidentifying speech-in-noise intelligibility.
Abstract
Background and Objectives A Korean Matrix Sentence Test is one of the adaptive testsused to evaluate speech intelligibility in noise. The present study aimed to investigate the influenceof measurement procedure (presentation level and mode) on the Korean matrix sentence-in-noise intelligibility of normal-hearing listeners. Subjects and Method Twenty-seven normal-hearing adults participated in the study. Thespeech reception threshold (SRT) was determined using a software-based adaptive procedure,which converges on the signal-to-noise ratio (SNR), corresponding to 50% intelligibility. Thespeech or speech-shaped noise was given at three presentation levels based on the previouscategorical loudness judgments (between soft and medium: 55 dB SPL, medium: 65 dB SPL,and loud level: 80 dB SPL). The effect of the presentation mode was explored by fixing eitherthe sentence level or noise level, while the noise or sentence level was adaptively adjusted accordingto the subject’s response. Results The presentation level significantly affected the SRTs, whereas the SRTs did not dependon the presentation mode. The sentence-in-noise intelligibility was similar between 55and 65 dB SPL, yet the sentence-in-noise intelligibility significantly decreased at 80 dB SPLregardless of the presentation mode. Correlation analyses showed moderate to high positivecorrelations among the results of two presentation modes. Conclusion A presentation level of 55 or 65 dB SPL yielded comparable adaptive measurementresults for normal-hearing subjects, yet the sentence-in-nose intelligibility became worseat 80 dB SPL. Clinicians should be careful with the influence of the presentation level whenidentifying speech-in-noise intelligibility.
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