Chutchavong, Vanvisa

Preferred name

Alternative Name

Chutchavong, V.

Main Affiliation

School of Engineering

vanvisa.ch@kmitl.ac.th

Now showing 1 - 10 of 13

Some of the metrics are blocked by your
consent settings
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.
Some of the metrics are blocked by your
consent settings
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.
Some of the metrics are blocked by your
consent settings
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.
Some of the metrics are blocked by your
consent settings
Measurement and examination of the relation between ionospheric scintillation expression methods in equatorial region
(2002-01-01)
Chutchavong, V.
;
Sangaroon, O.
;
Janchitrapongvej, K.
;
Nakasuwan, J.
;
Moriya, Y.
This paper examines the method for converting among scintillation expression methods, peak to peak values method and standard deviation values method, by using local measurement of meteorological parameters. Part I focus on tropospheric scintillation related to 12.260 GHz measurements at an elevation angle of 59.9°. Part II focus on ionospheric scintillation describes 3.916 GHz, observations made on three years periods at KMITL, Bangkok, Thailand. The principle techniques finding the good correlation coefficient ranging from 0.900 to 0.999. As a result extremely the relationship between two methods is given by σ<inf>x</inf>=α(p-p) + β, where α is 0.14.
Some of the metrics are blocked by your
consent settings
On approximation of linear gain equalizer by q-Bernstein-Stancu operators and Möbius transformation
(2018-07-02)
Chutchavong, V.
;
Dokyam, T.
;
Janchitrapongvej, K.
;
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.
Some of the metrics are blocked by your
consent settings
Approximation of sine-squared pulse with additional transmission zero using bessel polynomials
(2017-11-24)
Chutchavong, V.
;
Anuwongpinit, T.
;
Benjangkaprasert, C.
;
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.
Some of the metrics are blocked by your
consent settings
A new method for design of the linear gain equalizer based on stancu’s including bernstein polynomials
(2017-11-24)
Chutchavong, V.
;
Dokyam, T.
;
Benjangkaprasert, C.
;
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.
Some of the metrics are blocked by your
consent settings
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.
Some of the metrics are blocked by your
consent settings
On design of video equalizer for distorted chrominance based on the Bernstein Polynomials
(2006-12-01)
Chutchavong, V.
;
Benjangkaprasert, C.
;
Janchitrapongvej, K.
In this paper, we propose a design of video equalizer for compensating the amplitude of chrominance signal based on the Bernstein Polynomials. The use of Bernstein Polynomials in analog filter obtain the advantages are linear phase filter, several parameters that control the amount of phase and magnitude, and flexible for variable of phase. In addition, experimental results are carried out by using the modulated 20T sine squared signal. It is shown that the proposed video equalizer can be enhanced or compressed the amplitude chrominance distortion in color television transmission. © 2006 IEEE.
Some of the metrics are blocked by your
consent settings
Adaptive equalization of the distorted chrominance signal using VSQLMp error criterion
(2004-12-01)
Chutchavong, V.
;
Rukluea, P.
;
Benjangkaprasert, C.
;
Sangaroon, O.
;
Janchitrapongvej, K.
This paper presents an adaptive equalizer using FIR Filter and variable step-size quantize least mean p-power error criterion (VSQLMp) algorithm for compensating the amplitude of Chrominance signal. The proposed equalizer can be enhanced and compressed the chrominance signal at color subcarrier and it is not taken into account how the signal is distorted. In addition, experimental results are carried out by using the modulated 20T sine squared signal.

Chutchavong, Vanvisa

Filters

Settings

Sort By

Results per page