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Aiming at the shortcoming of median filter and some improved algorithms for removing salt and pepper noise, we propose an improved filtering algorithm to preserve image details in this paper. According to the different features between salt and pepper noise and image details, we get a noise marked matrix by extremum detecting and line detecting. Then the noise pixel's value is determined by adjoin...
In order to compensate the nonlinearly distorted echo in hands-free telephone, a memoryless power-series polynomial nonlinear acoustic echo canceller (AEC) can be used. Conventional nonlinear AEC employs a NLMS adaptive algorithm which can fail to converge in case of double talk or a very noisy environment. In this paper we propose a higher order correlation algorithm using a white Gaussian training...
Input signals decomposition in digital spread spectrum communication systems(DSSS) is researched with discrete wavelet packet transform, the principle for wavelet packet transform suppressing narrow-band interference is analyzed, the former algorithm is optimized and the corresponding adaptive interference suppression technique is presented. The adaptive filtering technique is adopted to replace sub-band...
In order to compensate the nonlinear distortion in the hands-free telephones or teleconferencing system, a memoryless power- series-based polynomial NLMS adaptive filter can be used to cancel nonlinear acoustic echo. Conventional polynomial model employs a power-series expansion. In this paper we propose an orthogonal polynomial adaptive filter to accelerate the convergence rate of the nonlinear adaptive...
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