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Sine-Squared Pulse Approximation for Matched Filter Design Using Generalized Bessel Polynomials and Particle Swarm Optimization
(2022-01-01)
Chutchavong, V.
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Anuwongpinit, T.
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Pumee, T.
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Benjangkaprasert, C.
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Janchitrapongvej, K.
This paper presents the study of mathematical characteristics of generalized Bessel polynomial that can be applied to approximate a sine-squared pulse for designing matched filters in communication systems. The proposed pulse can be designed by using the transfer function, in which the numerator is the five pairs of a transmissions zero pairs, and the generalized Bessel polynomial is used as the denominator. A parameters of generalized Bessel polynomials can be adjusted by particle swarm optimization to find the best parameter value. From the simulation results can be found that a parameter can be adjusted. A proposed pulse is close to the ideal response in mainlobe, and one sidelobe to four sidelobes with stability, which outperformed previous research.
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Approximation of the maximally flat filter by using Bézier curve with an exponential function
(2020-02-24)
Purahong, B.
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Kanjanasurat, I.
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Sithiyopasakul, P.
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Chutchavong, V.
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Pintavirooj, C.
This paper presents a design of filter by using Bézier curve with an exponential function. This paper used the advantage of The Bézier curve which had ability for approximation and an exponential function which had the adaptable parameters of the polynomial. It can adjust the characteristic of frequency response for the best performance. The simulation results of various setting show the frequency response, step response. The comparison of response between the Bernstein filter and Butterworth filter in order two show that the rise time of Bernstein filter better than Butterworth filter and Bézier curve filter has not overshoot. Furthermore, the stability Nyquist criterion has been used to guarantee the stability of the transfer function.
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On approximation of linear gain equalizer by q-Bernstein-Stancu operators and Möbius transformation
(2018-07-02)
Chutchavong, V.
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Dokyam, T.
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Janchitrapongvej, K.
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Benjangkaprasert, C.
This paper presents the design of linear gain equalizer by using Bernstein polynomials including q-Bernstein-Stancu operator and Möbius transformation. This method has the adjustable parameters more than the many types of Bernstein operators, these parameters can use to adjust the important characteristics of a linear gain equalizer for the best result. The simulation results show maximally flat magnitude, non-minimum linear phase and nearly constant delay for both of low-gain and high-gain equalizer. Furthermore, the Mikhailov's criterion has been used to guarantee the stability of desired transfer function.
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Implementation of ECG portable device for real-time signal monitoring
(2017-11-24)
Purahong, B.
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Thongkrairat, S.
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Anuwongpinit, T.
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Chutchavong, V.
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Aoyama, H.
In this paper presents a system for heart rate signal analysis in ECG (Electrocardiography) format using STM32f7 board. Electrode is used for recording the signal with stick on body in lead 2 orientations. Signal processing method are used upper average, slope and interval checking algorithm to process ECG signal in real-time. In experiment, to acquire a frequency of heart beat and display ECG signal and heart rate on STM32f7 board compare with wearable device that result have error rate less than 1%. This system is portable to use and sufficient battery for recording signal to analyze and monitor throughout the day.
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Low pass filters based on bernstein-balazs operators
(2017-11-24)
Chutchavong, V.
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Tharaphimaan, P.
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Anuwongpinit, T.
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Purahong, B.
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Janchitrapongvej, K.
This paper presents a design of low-pass filter by using Bernstein-Balazs operators. It has more parameters than classical Bernstein polynomials. The parameters and can adjust maximally flat, slope of linear phase and constant of delay. In the results, the proposed method shows the magnitude response has maximally flat, linear with non-minimum phase and nearly constant delay. The example of applications of this proposed method is desired to design the gain equalizer at -1dB and confirm the stability of the approximated transfer function by Mihailov’s criterion.
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Approximation of sine-squared pulse with additional transmission zero using bessel polynomials
(2017-11-24)
Chutchavong, V.
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Anuwongpinit, T.
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Benjangkaprasert, C.
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Janchitrapongvej, K.
In this paper, the approximation of sine-squared pulse based on Bessel polynomials with additional transmission zero is presented. The additional transmission zero has a parameter alpha to control the attenuation response. The simulation results show the additional transmission zero can control the peak of attenuation response close to the ideal response. In addition, the orders of Bessel polynomials are decreased that confirm a performance is better than the previous works.
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A new method for design of the linear gain equalizer based on stancu’s including bernstein polynomials
(2017-11-24)
Chutchavong, V.
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Dokyam, T.
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Benjangkaprasert, C.
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Janchitrapongvej, K.
This paper presents an approximation of transfer function for gain equalizer based on the Bernstein-Stancu polynomials operators, which used to equalize the linear gain distortion. As the well-known that the Bernstein-Stancu polynomials have an adjustable parameter more than the classical Bernstein polynomials, it can be used to adjust a response for the best result. As the result, the proposed method to design gain equalizer has a good performance both of low-gain distortion and high-gain distortion. In addition, the stability of desired transfer function is verified by using the Mikhailov’s criterion.
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Bernstein polynomial and rational Bézier curve for blood pressure simulation
(2017-02-08)
Kanjanasurat, I.
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Chutchavong, V.
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Pirajnanchai, V.
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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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A mathematical model for ECG waveform using rational Bézier curves and Bernstein polynomials
(2014-01-01)
Chutchavong, V.
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Nualon, K.
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Sangaroon, O.
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Janchitrapongvej, K.
This paper presents a mathematical model for ECG waveform using Rational Bezier curves and Bernstein polynomials. There are three mathematical models; the Bernstein polynomials model, the Bézier-Bernstein model and the Rational Bézier-Bernstein model. All mathematical models can generate the ECG waveform which is similar to the normal ECG waveform. Moreover, all mathematical models can simulate a normal ECG waveform as well. As the results, the Rational Bezier-Bernstein model is a simple form, easy to make a circuit and lower cost in the implementation of the ECG waveform. © 2014 IEEE.
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A variable luminance-chrominance gain equalizer
(2010-07-30)
Chutchavong, V.
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Poungpayom, S.
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Sangaroon, O.
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Benjangkaprasert, C.
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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.

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