Abstract
This paper presents a sub μW 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-μm CMOS process and consumes only 0.65 μW power at 1.0 V with a speech quality that is comparable to that achieved using other high-complexity algorithms.
Original language | English |
---|---|
Article number | 5740627 |
Pages (from-to) | 937-947 |
Number of pages | 11 |
Journal | IEEE Transactions on Very Large Scale Integration (VLSI) Systems |
Volume | 20 |
Issue number | 5 |
DOIs | |
State | Published - May 2012 |
Keywords
- Acoustic noise
- VLSI
- hearing aids
- low power design
- speech processing