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Author: search.filters.author.Jorphochaudom, S.

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    Hybrid algorithm for adaptive IIR notch filter
    (2008-12-01)
    Jorphochaudom, S.
    ;
    Benjangkaprasert, C.
    ;
    Sangaroon, O.
    ;
    Janchitrapongvej, K.
    In this paper presents the hybrid algorithm for adaptive IIR notch filter using the combination of genetic algorithm in parallel with variable step-size algorithm. This application is used for frequency estimation in background noise such as Gaussian noise or impulse noise. The objectives are enhancing the performance of adaptive IIR notch filter, for instance, fast convergence speed, low mean square error (MSE) and especially for noise robustness in high amplitude impulse noise situation. From the experiment results show that the proposed algorithm gives good performance, such as fast convergence speed, noise robustness, low MSE and can be used to eliminating 50 Hz power line interference, which induce to disturb the signal of electrocardiogram (ECG) of patient while the physician is recording it.
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    The combination of genetic algorithm and variable step-size algorithm for adaptive IIR notch filter
    (2003-12-01)
    Benjangkaprasert, C.
    ;
    Jorphochaudom, S.
    ;
    Chompoo, S.
    ;
    Sangaroon, O.
    ;
    Janchitrapongvej, K.
    In this paper, the combination algorithm for a second-order adaptive IIR notch filter is presented. The proposed algorithm is based on the genetic algorithm as an initial stage of adaptation process, as we approach the optimum step-size parameter, we using the new variable step-size algorithm. By this technique, the new algorithm achieves the optimum step-size parameter of the filter coefficient for an adaptive IIR notch filter. The results of computer simulation show that the new algorithm provides a good performance such as fast convergence rate, low mean square error and noise robustness. In addition, the new algorithm is also applied to cancel 50-Hz power line interference in the recording of electrocardiograms signal. © 2003 IEEE.
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    A new gradient-based algorithm using variable step-size technique and its application [adaptive IIR notch filter]
    (2002-01-01)
    Benjangkaprasert, C.
    ;
    Jorphochaudom, S.
    ;
    Phuvasitkul, S.
    ;
    Anantrasirichai, N.
    In this paper, a new class of gradient-based algorithm by using variable step-size technique for a second-order adaptive IIR notch filter is presented. An adaptation step-size parameter for the algorithm is worked out from the output signal and the gradient signal. The adaptive algorithm is used for detection of a sinusoid with additive white Gaussian noise, impulse noise and cancellation of 50-Hz interference in the recording of electrocardiogram signals. The performance of this algorithm is proved here to give high convergence speed, high impulse noise robustness and good efficiency of 50-Hz interference cancellation. Finally, the results of computer simulation are given to demonstrate the performance of the proposed algorithm for the adaptive IIR notch filter.