Enhancement of noise reduction efficiency based on compensation in the ANC headset using fixed-point DSP |
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Authors: | Cholnam Kim Chol Jong Xiaotong Zhang Peng Wang Jinhyok Kim |
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Affiliation: | 1. School of Computer & Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Telecommunication Research Center, Kim Il Song University, Pyongyang 999093, Democratic People’s Republic of Korea |
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Abstract: | In this paper, we have proposed a new algorithm considering commutation error and feedback effect to enhance the convergence rate and noise reduction efficiency of ANC controller. In order to improve noise reduction performance of the ANC headset with fixed-point DSP, we have proposed a new FxLMS algorithm, FxLMS CF, which considers the commutation error and feedback. Also, using a non-real-time simulation, we have decided the phase and amplitude compensation factors of anti-noise signal considering round-off and quantization error, nonlinear distortion and delay of analog device. We estimated the phase and amplitude compensation factors by simulation without using any special measuring devices or analysis devices, and reduced the broadband noise by 24 dB. |
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Keywords: | Active noise control (ANC) Fixed-point DSP Filtered-x LMS (FxLMS) Quantization and round-off error Active noise reduction |
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