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A Zero Phase Noise Reduction Method with Damped Oscillation Estimator
Sayuri KOHMURA Arata KAWAMURA Youji IIGUNI
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/10/01
Online ISSN: 1745-1337
Type of Manuscript: PAPER
Category: Digital Signal Processing
noise reduction, speech enhancement, impact noise, damped oscillation,
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This paper proposes a noise reduction method for impact noise with damped oscillation caused by clinking a glass, hitting a bottle, and so on. The proposed method is based on the zero phase (ZP) signal defined as the IDFT of the spectral amplitude. When the target noise can be modeled as the sum of the impact part and the damped oscillation part, the proposed method can reduce them individually. First, the proposed method estimates the damped oscillation spectra and subtracts them from the observed spectra. Then, the impact part is reduced by replacing several samples of the ZP observed signal. Simulation results show that the proposed method improved 10dB of SNR of real impact noise.