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    Mathematical model of audiogram with second order recursive system
    (2011-12-01)
    Jongsataporn, Thitaphan
    ;
    Yimman, Surapun
    ;
    Praesomboon, Sukanya
    ;
    Dejhan, Kobchai
    This research presents a new design of mathematical model of audiogram by using the second order recursive all-pass filter and least square approximation technique. The initial step is to design the system function of second order all-pass filter that have the pole-zero angle corresponds with the minimum and maximum amplitude of audiogram. After that, using the least square approximation technique to find the distance of pole and zero between the origin. For the appropriate zero position used least square technique. The magnitude response of propose design was simulated by MATLAB software, the simulation result have show that this method could perform be similar to the audiogram. © 2011 IEEE.
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    Novel amplitude compensation for digital signal processing system using minimum phase filter
    (2011-12-01)
    Praesomboon, Sukanya
    ;
    Dejhan, Kobchai
    ;
    Yimman, Surapun
    ;
    Phromlikhit, Chanchai
    This paper proposes minimum phase filter design and applications. The property of a minimum phase filter is having the poles and zeros inside the unit circle. The initial step is to design a minimum phase filter to obtain the specified analog of the reconstruction low pass filter, convert to digital filter using the approximate of derivative and inverse system and next the system of minimum phase filter could be implemented by output function software of digital signal processing system. The experimental result of this proposed method can also be used to compensate for attenuation of the output amplitude obtained from the reconstruction filter at high frequency of digital signal processing system. © 2011 IEEE.
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    Minimum phase filter design for reconstruction filter compensation
    (2010-12-01)
    Yimman, Surapun
    ;
    Praesomboon, Sukanya
    ;
    Dejhan, Kobchai
    This paper proposes minimum phase filter design and its applications. Which the properties of the minimum phase filter have the poles and zeros inside unit circle. The design step of the minimum phase filter, design the analog low-pass filter as reconstructions filter or output filter for digital signal processing system. The reconstruction filter is used as smoothing function for the output signal utilizing approximate derivative method and inverse transformation. The results show that the proposed method can be used to compensate attenuation of the output amplitude obtained from the reconstruction filter (for high frequency of digital signal processing system).
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    Sensorless speed control of DC servo motor using Kalman filter
    (2009-12-01)
    Praesomboon, Sukanya
    ;
    Athaphaisal, Santi
    ;
    Yimman, Surapun
    ;
    Boontawan, Rodjarin
    ;
    Dejhan, Kobchai
    This research aims to study speed sensorless DC motor control using Kalman filter. Kalman filter considers the DC motor mathematical model. The model will start from a continuous state space into a discrete state space form. Inputs of the system are the armature voltage and the armature current with noises. The output of the system is the estimated speed. Kalman filter is used to estimate the speed without noise interference. The result from the estimated speed will be compared with the reference speed and the speed error will be used by the controller to control the linear amplifier. The final output is the constant speed of the DC motor. Even though the load of the DC motor changed the speed of the DC motor remains constant under the control. The experiment shows that Kalman filter can reject the noise from the system and can estimate the speed of the DC motor with a high accuracy. The estimated speed will be feedback to control the system for constant speed. ©2009 IEEE.
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    Design and implementation of novel impedance measurement using digital sine-wave oscillator with optimum phase and amplitude
    (2009-12-01)
    Praesomboon, Sukanya
    ;
    Jongsataporn, Thitaphan
    ;
    Yimman, Surapun
    ;
    Cheevasuvit, Fusak
    This paper proposed the AC bridge circuit, which can be used to measure unidentified impedance of the system. The AC bridge circuit takes the advance of both a digital sine-wave oscillator, which can promptly adjust the phase of generated signals, and a successive approximation technique, which can profoundly search for the unknown impedance. Therefore, the optimum phase and the suitable amplitude can be immediately determined for the AC bridge circuit. In this study, the unknown impedance were calculated by the AC bridge circuit at these following frequencies 50Hz, 100Hz, 300Hz, 500Hz, 750Hz and 1kHz. When compared with the LCR meter (Agilent 4284A), the result of the measured impedance from the AC bridge circuit has revealed the impedance with estimate 1% average error, which suggested that AC bridge circuit is a perfectly innovation method for identifying the unknown impedance. © 2009 SICE.
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    IIR multiple notch filters design with optimum pole position
    (2006-12-01)
    Yimman, Surapun
    ;
    Praesomboon, Sukanya
    ;
    Soonthuk, Parinya
    ;
    Dejhan, Kobchai
    The following article introduces the new design and implementation of IIR multiple notch filters by the application of suitable pole placement technique. The initial step is to design the two IIR single notch filters with difference notch frequency to find suitable pole that can control the pass-band gain at 3 frequencies such as DC, π and frequency between the notch frequency. After that, connect the IIR single notch filters with difference notch frequency in cascade to create IIR multiple notch filters which can control the pass-band gains at DC and π frequency especially the frequency between the notch frequencies. © 2006 IEEE.
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    Two-pole band-pass filter based on all-pass filter
    (2005-12-01)
    Yimman, Surapun
    ;
    Praesomboon, Sukanya
    ;
    Navarattara, Suparee
    ;
    Klunium, Sawitree
    ;
    Dejhan, Kobchai
    This paper proposes the new two-pole band-pass filter design principle for the all-pass filter and notch filter by applying the least square. The first step is to design notch filter by using pole-zero placement and then modify pole positions to control pass-band filter gain to ensure the symmetry with the maximum gain at the target level. After that, there is the design of all-pass filter with pole at the same positions as the notch filters to make the negative cascade with the designed notch filter to get the transfer function with band-pass filter magnitude response. The results from the experiments on MATLAB have shown the two-pole band-pass filter of the new design with the accurate and symmetric gain. © 2005 IEEE.