Chivapreecha, Sorawat

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Chivapreecha, Sorawat
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Chivapreecha, S.
Chivapreecha, Sorwat
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Email
sorawat.ch@kmitl.ac.th

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    Item type:Publication,
    A Cubic Hermite variable fractional delay filter
    (2011-12-01)
    Soontornwong, Parinya
    ;
    Chivapreecha, Sorawat
    ;
    Pradabpet, Chusit
    This paper presents a design and realization of cubic Hermite variable fractional delay (VFD) filter. Cubic Hermite interpolation will be formulated to cubic Hermite VFD filter which the amplitude response and delay response of proposed cubic Hermite VFD filter depend on the used approximation of first derivative. The structure realization of cubic Hermite VFD filter is shown based on Farrow structure as well. Finally, the amplitude response and delay response of the proposed cubic Hermite VFD filter will be compared with the cubic B-spline and Lagrange-type VFD filter. © 2011 IEEE.
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    Design and Implementation of Multiphase Digital Oscillator
    (2024-01-01)
    Jongsataporn, Thitaphan
    ;
    Yospanya, Poonna
    ;
    Chivapreecha, Sorawat
    This paper presents a design and implementation of the multiphase digital oscillator, which can determine the initial phase of multi-output signals to desired initial phases. The proposed system consists of biquad digital oscillator to oscillate the reference signal, and the new phase shifters which are first order IIR filters that can shift the phase of signals at a specified frequency to give them the desired phases. Design example and simulation results will be shown. Moreover, real-time hardware implementation on STM32 digital signal processor can be demonstrated to confirm the proposed design can work with hardware experimental results.
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    Thai Musical Instrument 'Gong Wong' Sound Synthesis and Its Modification to Standard Musical Note
    (2018-12-24)
    Nulyaporn, Natta
    ;
    Sirimangkala, Techawit
    ;
    Prasongtham, Chalathorn
    ;
    Chivapreecha, Sorawat
    Since Gong Wong is the tune keeper of Thai music, it is the most essential instrument in various Thai orchestra band. However, it's popularity has been significantly decreased throughout the time. One of the main reasons might be its monotonous of the musical notes that restricts the variety of song writing. The process of Gong Wong sound synthesis [1] can yield the results in both original and other musical notes sound synthesis. Therefore, this piece of work can be the leverage in Thai song composing. The method presented in this paper will be the analysis of Gong Wong fundamental sound frequency through the power spectral frequency and its decay rates measured through reverberation times of the Gong Wong based on an assumption that the Gong Wong sound is a composition of exponential decay sinusoids. The frequencies and decay rates found from the analysis will be used in designing the infinite impulse response filter with help from the method of Z-Transform. The digital filter coefficients will be stored as a synthesized sound library.
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    A Deep Learning Approach to Digital Filter Parameter Estimation Based on Amplitude Responses
    (2021-01-21)
    Yospanya, Poonna
    ;
    Chivapreecha, Sorawat
    ;
    Jongsataporn, Thitaphan
    This paper presents our attempt to tackle the problem of digital filter type and parameter estimation given a set of points sampled from a filter frequency response. We compared results from various multilayer perceptron and convolutional neural network configurations. The results suggest that a convolutional neural network generally produces faster convergence with a lower loss at the same number of epochs than a multilayer perceptron network. However, the maximum amplitude response error, which is the true performance metrics, can be comparable in some cases. A combination of multiple best-performing configurations for different tasks is used to assemble the final model.