Browsing by Author "Chang, Wei-Han"

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Complexity-effective auditory compensation for digital hearing aids
(2008)
Kuo, Yu-Ting
;
Lin, Tay-Jyi
;
Chang, Wei-Han
;
Li, Yueh-Tai
;
Liu, Chih-Wei
This paper describes a complexity-effective design of auditory compensation, which is the most important building block in digital hearing aids. A multi-rate architecture and the filter bank design thereof are proposed to significantly reduce the data rates of the band-limited channels and thus the computational complexity. Several optimizations are discussed to further simplify the implementation of the dynamic range compressors in the multi-rate auditory compensation. In an 18-band 24-KHz digital hearing aid, 94% multiplications and additions are saved from a straightforward filter bank design. Moreover, the computation and memory requirements of the dynamic range compressor of each band are reduced to only 16% and 1% respectively.
Design of ANSI S1.11 filter bank for digital hearing aids
(2007)
Kuo, Yu-Ting
;
Lin, Tay-Jyi
;
Li, Yueh-Tai
;
Chang, Wei-Han
;
Liu, Chih-Wei
Existing digital hearing aids, to our knowledge, all exclude ANSI S1.11-compliant filter banks because of the high computational complexity. Most ANSI S1.11 designs are IIR-based and only applicable in applications where linear phase is not important. This paper presents an FIR-based ANSI S1.11 filter bank for digital hearing aids, which adopts a multi-rate architecture to reduce the data rates on the bandwidth-limited bands. A systematic way is also proposed to minimize the FIR orders thereof In an 18-band digital hearing aid with 24 kHz input sampling rate, the proposed design with linear phase has comparable computational complexity with IIR filter banks. Moreover, our design requires only 4% multiplications and additions of a straightforward FIR implementation.