WDRC释放时间对普通话言语理解度的影响研究

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(

Effect of release time in WDRC on mandarin speech intelligibility

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.