CAJ | 학술논문

宽动态范围压缩算法作为助听器非线性听力补偿的核心算法，其释放时间常数的设定可影响言语理解度。根据普通话的语音特点，将宽动态范围压缩算法按频率范围划分为低频区间(<2000 Hz)和高频区间(>=2000 Hz)，并采用不同的释放时间常数。低频区间和高频区间释放时间常数均采用5 ms、100 ms及2000 ms，但各自交叉配对为实验条件，共形成9组实验条件。以正常听力者为实验对象，通过仿真平台输出普通话言语仿真声，进行噪声下普通话言语理解度测试。实验结果显示，低频区间时间常数过短或高频区间时间常数过长都将影响普通话言语理解度。实验结论对我国助听器WDRC参数的设定有一定参考价值。
관동태범위압축산법작위조은기비선성은력보상적핵심산법，기석방시간상수적설정가영향언어리해도。근거보통화적어음특점，장관동태범위압축산법안빈솔범위화분위저빈구간(<2000 Hz)화고빈구간(>=2000 Hz)，병채용불동적석방시간상수。저빈구간화고빈구간석방시간상수균채용5 ms、100 ms급2000 ms，단각자교차배대위실험조건，공형성9조실험조건。이정상은력자위실험대상，통과방진평태수출보통화언어방진성，진행조성하보통화언어리해도측시。실험결과현시，저빈구간시간상수과단혹고빈구간시간상수과장도장영향보통화언어리해도。실험결론대아국조은기WDRC삼수적설정유일정삼고개치。
In digital hearing aids, wide dynamic range compression algorithm (WDRC) is commonly treated as the core algorithm to compensate loudness. Differences between release time constants in WDRC can affect speech intelligibility (SI). Based on unique acoustic characteristics of Mandarin, WDRC algorithm are divided into two parts: low frequency (LF) channel and high frequency (HF) channel. Release time constants are taken as 5 ms, 100 ms, and 2000 ms in either LF channel or HF channel. Combining a certain LF release time constant with a certain HF one forms totally nine different release time combinations for hearing tests. Normal hearing objects go through the Mandarin SI tests with speech shaped noise. The testing material is Mandarin sentences which are the outputs of WDRC simulation in the 9 different release time combinations. Test results show that too short release time in LF channel or too long release time in HF channel trends to decrease Mandarin SI. The results can be a reference for WDRC parameter setting of Mandarin speaker.