Chutchavong, Vanvisa

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Chutchavong, Vanvisa
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Chutchavong, V.
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vanvisa.ch@kmitl.ac.th

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    Equalization of the distorted chrominance signal using IIR digital filter with the bernstein filter
    (2005-01-01)
    Chutchavong, V.
    ;
    Janchitrapongvej, K.
    ;
    Pirajnanchai, V.
    In this paper, we present the use of the Bernstein Polynomials to obtain an IIR digital filter transfer function, which can be applied to video equalizer for compensating the amplitude of chrominance signal in color television. In addition, experimental results are carried out by using the modulated 20T sine squared signal on the color sub carrier 4.43 MHz. It is shown here that the proposed equalizer can either enhance or compress the chrominance signal in color television transmission.
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    Bernstein polynomial and rational Bézier curve for blood pressure simulation
    (2017-02-08)
    Kanjanasurat, I.
    ;
    Chutchavong, V.
    ;
    Pirajnanchai, V.
    ;
    Janchitrapongvej, K.
    This paper presents blood pressure waveform simulation using the Bernstein polynomial model, Bézier-Bernstein model, and Rational Bézier-Bernstein model. All mathematical models can generate the blood pressure waveform which is similar to the normal blood pressure waveform. Moreover, all mathematical models can simulate a normal blood pressure waveform as well. As the results, the Rational Bezier-Bernstein model is a simple form, low order, easy to implement in the microcontroller.
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    An IIR digital video equalizer design with the bernstein polynomial and generalized bilinear transformation for gain chrominance distortion
    (2008-12-01)
    Chutchavong, V.
    ;
    Sangaroon, O.
    ;
    Pirajnanchai, V.
    ;
    Janchitrapongvej, K.
    Video equalizer design for compensated the distortion of the chrominance amplitude in color television transmission system is presented. The approximation is based on the Bernstein Polynomials and generalized bilinear transformation to obtain the transfer function. This approach has several parameters can be varied satisfying stability conditions. And the advantages of the Bernstein Polynomials when compared to the Butterworth, Chebyshev and Thomson Polynomials are three parameters available control the amount of phase and magnitude, linear phase, and flexible for variable of phase. Among all referred advantages so that these methodologies were applied in this paper. In addition, the pulse and bar test signal which has been used to measure linear waveform distortion in TV system is special the modulated 20T sine squared pulse with color sub-carrier 4.43 MHz for PAL system. As a result, the proposed digital video equalizer can be enhance and compress the gain chrominance distortion without degraded it phase characteristic.
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    A variable luminance-chrominance gain equalizer
    (2010-07-30)
    Chutchavong, V.
    ;
    Poungpayom, S.
    ;
    Sangaroon, O.
    ;
    Benjangkaprasert, C.
    ;
    Janchitrapongvej, K.
    This paper presents a variable luminance-chrominance gain equalizer for correcting the linear chrominance gain distortion in color TV transmission system. The new technique shows that the chrominance signal amplitude at 4.43 MHz can be controlled by using a delay line network in parallel with a variable resistor R<inf>T</inf>. Therefore, the proposed gain equalizer can be controlled by means of variable resistor R<inf>T</inf> and R<inf>Y</inf> for correction of the chrominance gain distortion. It is also proved to be efficient in equalizing because it offers more advantages. Among the advantages obtained using a delay line network in parallel with a variable resistor when compared to the gain equalizer provide by the other filters. First of all, it can provide a wide range of gain control. Secondly, the circuit of the proposed gain equalizer is simple with low cost. Next, it is also low complexity. At last, the chrominance gain distortion can be easily corrected without much serious delay error. Additionally, a modulated 20T sine-squared pulse test signal is used to test the performance of the proposed gain equalizer.