Wardkein, Paramote
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Wardkein, Paramote
Alternative Name
Wardkein, P.
Wardkein, Pramote
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paramote.wa@kmitl.ac.th
135 results
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Item type:Publication, Chainsaw location finding based on travelling of sound wave in air and ground(2020-04-08) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Distance Measurement Technique Using Phase Difference of Two Reflected Ultrasonic Frequencies(2018-09-11); Boonjun, SurapolThis paper proposes a simple method of distance measurement utilizing phase difference of two reflected ultrasonic frequencies. To obtain the phase difference, an alternating signal which contains two sinusoidal signals having different frequencies is fed to an ultrasonic transmitter. When the transmitted signal is reflected and received by the ultrasonic receiver, the received signal is first squared. Then, a time shift property of Fourier transform is applied to the squared signal to acquire the phase difference. The phase difference is converted to a time-of-flight (TOF) value and turned to the distance. To experiment the proposed technique, a DSP TMS620C6713 board is employed to generate the alternating signal as well as to receive the reflected signal, and to process the received signal. In the experiment, two sinusoidal signals having frequencies of 39.85 kHz and 40.6 kHz are used. The results show that the obtained distance by the presented approach has fairly low error only 0.15 centimeters compared to the actual distance. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A temperature-insensitive VCO and derivative PWM signal generator(2001-12-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Reliability optimization of topology communication network design using an improved ant colony optimization(2009-09-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A new automated heart defect detection based on signals and systems concept(2006-12-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Economic and reliability of telecommunication network design using multiple Tabu search algorithm(2004-06-28) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Development of a Phase-Locked Loop Circuit in Running Frequency Mode for Capacitance-to-Voltage Conversion(2025-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Amplitude demodulation based on time-varying forced input of second-order oscillator circuit(2009-12-01); In this article, a novel coherent amplitude demodulation based on time-varying force function of secondorder oscillator circuit and injection locking Phenomenon is proposed. The compactness of demodulation circuit is obtained because amplitude demodulation mechanism is inherent in one oscillator circuit. With injection locking property, frequency and phase of the oscillator is identical to that of the transmitted carrier. Based on time varying force function which is an AM signal, coherent demodulation is taken place. In laboratory experiment, the Colpitts oscillator at UHF band is employed where experimental results agree well with the proposed principle. ©2009 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Novel Double Slope Frequency Shift Chirp Symbol(2024-01-01); One of the most significant concerns in serial digital communication is the synchronization of data bits between the transmitter and receiver. Therefore, the preferred coding symbols should contain an inherited clock signal. The cyclic-shift chirp, which is primarily used in long-range systems, employs a single slope in a symbol, which contains few information for synchronization. Hence, two new forms of cyclic-shift chirp symbols are proposed herein. The associated coding schemes are based on the use of a dual slope within one symbol. Synchronization is inherited in the coding symbol using a dual slope. Additionally, both proposed coding schemes utilize the same decoding technique. The decoded chirp symbol is in the form of a pulse width modulation signal, which can be used for synchronization and retrieving data bits from their duty cycle. The simulation results show that the coding and decoding processes of the proposed coding schemes align with those of a theoretical framework. The error performance analysis for the proposed detection scheme is given and the results of error probability analysis are consistent with the simulation results. Moreover, under a Rayleigh fading channel, the proposed coding schemes provide superior performance compared with other comparable coding schemes. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Inverse tangent based adaptive IIR notch filter(2006-12-01); The inverse tangent based second-order adaptive IIR notch filter (ITANF) is presented in this paper. It is well known that the gradient-based adaptive IIR notch filter (ANF) has inherent low convergence speed due to the flattened error function. Moreover, the magnitude of error function depends on magnitude of sinusoid which implies that the speed of convergence of the gradient-based adaptive algorithm also depends on the magnitude of an input signal. To improve such drawback, the new inverse tangent based adaptive algorithm for a second order IIR notch filter is therefore proposed. The proposed algorithm employs the ratio of output to input signals as an error criterion where the inverse tangent value of the ratio is employed to adapt the filter parameter. It is found that the proposed algorithm provides not only high speed convergence but also high impulse noise robustness. The simulation results confirm that the performance of the proposed algorithm has been improved over the conventional ANF. ©2006 IEEE.