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A reference ear modeling method for the real-time feedback controlled digital hearing aid chip is proposed and implemented. In order to reduce the modeling complexity and enhance the programmability, new ear modeling method using the acoustic filter theory is adopted to the digital hearing aid. To achieve the fully internal gain fitting and verification system, the responses from the damaged ear and...
The low-power, high-programmability digital hearing aid chip with consideration of human factors is implemented. To achieve the human factored design with low-power consumption, the dual threshold preamplifier and the multi-channel digital signal processor (DSP) are designed. The dynamic range of the dual threshold preamplifier exists from 0.45-V to 0.8-V and dissipates 32-muW from a single 0.9-V...
A low power fully operational digital hearing aid chip is proposed and implemented. The Sigma-Delta ADC adopts the status controller to realize adaptive SNR technique without any external control. To achieve both low power consumption and high programmability, dedicated low power DSP with 6 control parameters is designed. The heterogeneous Sigma-Delta DAC reduces more power dissipation without performance...
A full chip implementation of a low-power digital hearing aid is reported. It is composed of preamplifier, Sigma-Delta ADC, DSP and Sigma-Delta DAC with low-power technique. The hardwired DSP has 6 parameters to reduce power consumption with high flexibility. The Sigma-Delta DAC adopts heterogeneous frequency to reduce power consumption further. The proposed digital hearing aid chip achieves 79-dB...
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