Chutchavong, Vanvisa

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Chutchavong, Vanvisa
Alternative Name
Chutchavong, V.
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Email
vanvisa.ch@kmitl.ac.th

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    Synthesis of Crossover Network Using O′Shea′s Transformation via URC
    (2024-01-01)
    Janchitrapongvej, Kanok
    ;
    Chutchavong, Vanvisa
    ;
    Doungpan, Satawat
    ;
    Ngammongkolwong, Sudasawan
    ;
    Rattanathanawan, Pongpan
    This paper describes method of synthesis two-way cross-over network, namely low-pass filter and high-pass filter. Firstly, we introduce synthesis method of obtain all-pass filter. We introduce O′Shea′s transformation P(s) = cosh√SRC and Wyndrum′s transformation W(s) = tanh√SRC via uniformly distributed RC (URC) network. After obtaining a desired all-pass filter, as an elementary process. We construct low-pass filter and high-pass filter by means of all-pass filter basis. Simulation results MATLAB are carried out and stability are also investigated.
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    Design of Luminance-Chrominance Gain Equalizer Using Uniformly Distributed RC Circuits
    (2024-01-01)
    Chutchavong, Vanvisa
    ;
    Pirajnanchai, Virote
    ;
    Doungpan, Satawat
    ;
    Ngammongkolwong, Sudasawan
    ;
    Rattanathanawan, Pongpan
    The propose of this paper is to design the luminance-chrominance gain equalizer use in the video waveform transmission. As it is known, the conventional measurement and gain corrector of chrominance distortion equipment is not so simple. This network corrector has to use fillers and delay time to separate the luminance signal and chrominance signal by means of low-pass and high-pass filter in connection. Here in, we deploy the uniformly distributed RC circuit (URC). We introduce two types of equalizers. The first type is to correct the luminance signal without deteriorating the chrominance signal. The second type is designed to correct the chrominance signal with no effect to luminance signal. Both equalizers comprise of a few gain amplifiers and URC circuits. From the simulation results, it is shown that the frequency response of gain equalizer given good effective in correcting video signal distortion. We also introduce the modulated sine-squared pulse test signal for measuring and correcting the amount of low gain and high gain of the chrominance signal.
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    Synthesis of Video Gain Equalizer via Distributed circuits
    (2025-01-01)
    Chutchavong, Vanvisa
    ;
    Pirajnanchai, Virote
    ;
    Rattanathanawan, Pongpan
    ;
    Ngammongkolwong, Sudasawan
    ;
    Puntapa, Vorawut
    This paper presents a linear luminance and chrominance gain equalizer in video waveform transmission. Practically, the distributed devices have physical characteristics similar to the transmission line. Therefore, it can be employed to function in approximately as a passive lumped element. For this purpose, a novel transformation can be realized on equalizer using commemorated passive and active filters with uniformly distributed URC lines. In this paper we introduce two types of gain equalizers. The first type consists of resistive, conductive and capacitive, known as uniform GCR elements. The second type approximated by the uniformly distributed RC transfer function. As the results the proposed gain equalizer prove in equalizing both the luminance and chrominance gain distortions correction. From the simulation results, it is shown that the proposed distributed circuit gives good amplitude chrominance characteristic for both types of luminance gain equalizers.
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    Improvement of Renz's Active Band-Pass Filter Using Uniformly Distributed RC Circuit
    (2024-01-01)
    Wachirarattanapornkul, Sorapong
    ;
    Chutchavong, Vanvisa
    ;
    Attavunich, Pornsak
    ;
    Rattanathanawan, Pongpan
    ;
    Ngammongkolwong, Sudasawan
    This paper presents the improvement of Renz' s active band-pass filter. We proposed two types of band-pass filter. The first type of filter circuit structure, resembles to Renz's band-pass filter. The circuit comprising a single gain amplifier and three uniformly distributed RC network (URC). The second type band-pass filter circuit configuration consists of a gain amplifier with one URC and a double capacitive layer (DURC). From the experimental results, it is showed that the behavior of the proposed band-pass filter gives good narrow bandwidth, high Q and low sensitivities compared to the Renz's filter.