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This paper presents a low-power and real-time noise reduction (NR) algorithm using 18-band 1/3-octave quasi-ANSI filter bank for binaural hearing aids. With aids of binaural cues and minima controlled recursive average (MCRA) approach, the proposed NR algorithm consists of a directional mask and an estimated mask. The directional mask exploits the interaural time difference (ITD) together with the...
This paper presents a low-power hearing aid chip which operates under near-threshold voltage region to minimize energy consumption. The proposed variable-latency design technique compensates the performance degradation under ultra-low voltage, while the proposed FIR filter computing datapath improves the energy efficiency for filter bank computation in hearing aids. The hearing aid system composed...
The ANSI S1.11 1/3-octave filter bank is suitable for digital hearing aids, but its large group delay and high computational complexity complicate matters considerably. This study presents a 10-ms 18-band quasi-ANSI S1.11 1/3-octave filter bank for processing 24 kHz audio signals. We first discuss a filter order optimization algorithm to define the quasi-ANSI filters. The group delay constraint of...
The ANSI S1.11 1/3-octave filter bank is popular in many acoustic applications because it matches the human hearing characteristics. However, the long group delay and the high computational complexity limit the usage in hearing aids. A Quasi-ANSI S1.11 18-band 1/3-octave filter bank is proposed to reduce the group delay. With the matching error reduction method, the results show that the filter bank...
Auditory compensation consumes significant power due to the computation-intensive operations in the filter bank. To reduce the complexity, a controllable filter was designed to replace the filter bank. Filter order was designed to match prescriptions within a specific error constraint with minimum computational cost. An interpolation scheme according to the variation of signal intensity was implemented...
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