基于WDRC的听力损伤补偿算法研究

Algorithm Researching of Compensating Hearing Loss Based on WDRC

研究了基于宽动态范围压缩(Wide Dynamic Range Compression,WDRC)的听力损伤补偿算法。该算法简单实用,适合在DSP上实现,是目前大多数数字助听器中最核心的信号处理算法。在频率分析的基础上,根据信号的能量、变化速率等特征计算增益。并通过频响整形及最大输出限制算法完善增益。最后借助DSP实验平台实现算法并进行测试。测试结果表明,在满足失真度要求及频响曲线要求的情况下,该信号处理方法可以将声音信号压缩到理想的动态范围内。

A method of algorithm researching of compensating hearing loss based on wide dynamic range compression （WDRC） has been put forward in this paper. This algorithm which is uncomplicated, practical and fitting to DSP is the most significant signal processing algorithm in most of digital hearing aids at present. In this algorithm, based on the spectrum analysis, gains are calculated according to the features of input signal like energy, fluctuating rate and so on. The gains by frequency shaping and restraining the maximum output are adjusted. The algorithm is realized on DSP developing platform and practically tested. The testing result shows that, the algorithm can compress the signal into the ideal dynamic range, with the degree of distortion and frequency response satisfying.