Browsing by Author "Su, Sheng-Jie"

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Sub mu W Noise Reduction for CIC Hearing Aids
(2012-05-01)
Wei, Cheng-Wen
;
Su, Sheng-Jie
;
Chang, Tian-Sheuan
;
Jou, Shyh-Jye
;
電子工程學系及電子研究所
This paper presents a sub W noise reduction design to enhance speech for completely-in-the-canal (CIC) type hearing aids by optimizing its algorithm and associated architecture. In algorithm optimization, a low-complexity mixed perceptual-discrete wavelet packet transform (P-DWPT) and fast Hartley transform (FHT) are adopted for spectral decomposition and reconstruction. A simple yet efficient denoise method with 4-zone-voice activity detection (VAD) supports a consonant protection to improve speech quality and a skip scheme to reduce power consumption. In the designed architecture, mixed P-DWPT and FHT are folded into one 8-by-8 configurable butterfly computation unit with on-time scheduling for low power operation. The circuit is implemented with 0.18-mu m CMOS process and consumes only 0.65 mu W power at 1.0 V with a speech quality that is comparable to that achieved using other high-complexity algorithms.