Three-channel variable filter-bank for digital hearing aids
Three-channel variable filter-bank for digital hearing aids
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DOI：
10.1109/ispacs.2009.4806730
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发表时间：
2009-03
期刊：
影响因子：
--
通讯作者：
T. Deng
中科院分区：
文献类型：
--
作者：
T. Deng
提出了一种由可变低通、可变带通和可变高通数字滤波器组成的三通道可变滤波器组。这三个可变数字滤波器是使用模拟频率变换沿着修改的双线性变换从标准化的模拟原型切比雪夫I型低通滤波器获得的。由于三个可变数字滤波器的幅度（增益）和带边频率都是独立可调的，因此3通道VFB非常灵活，可以成功地应用于补偿数字助听器中的各种听力损失模式。各种听力图已被用来验证，高精度的拟合可以实现只有低阶（二阶）可变滤波器。
This paper proposes a three-channel (3-channel) variable filter-bank (VFB) that consists of variable lowpass, variable bandpass, and variable highpass digital filters. The three variable digital filters are obtained from a normalized analog prototype Chebyshev type-I lowpass filter using analog frequency transformations along with a modified bilinear transformation. Since both the magnitudes (gains) and band edge frequencies of the three variable digital filters are independently adjustable, the 3-channel VFB is considerably flexible, and can be successfully applied for compensating various hearing loss patterns in digital hearing aids. Various audiograms have been used to verify that high-accuracy fittings can be achieved with only low order (second-order) variable filters.