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Performance comparison of bit-level median filtering circuits based on binary search algorithm
(2018-06-08)
Wongjan, Anan
;
Julsereewong, Amphawan
;
Eguchi, Kei
Implementing bit-level median filtering circuits based on binary search algorithm is one of powerful methods to provide simple and modular configurations. The aim of this paper is to compare the performances of four median filtering circuits utilizing binary search algorithm in terms of operation time and power consumption, which are major characteristics for signal and image processing in real time. These studied filtering circuits are implemented through the employment of existing logic control and majority voting modules. Two different configurations of logic control module as well as two different configurations of majority voting module for four possible circuit realizations are described. LabVIEW simulation results are employed for verifying the performances of the studied median filtering circuits.
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Analog median filtering circuit using CMOS three-input max/min cell
(2018-06-08)
Wongjan, Anan
;
Julsereewong, Amphawan
;
Junsing, Tipparat
This paper presents a current-mode design technique for complementary metal oxide semiconductor (CMOS) implementation of an analog median filtering circuit for real-time signal processing. The proposed three-input median filtering circuit consists of three-input maximum/ minimum (max/min) cell, dual-output current mirrors, and current summation. The max/min cell used is based on an existing multiple-input max/min circuit for simultaneously determining the maximum and minimum values of input signals to overcome the limitations of tree realization by using two-input max/min selectors. Additionally, transistors used in the max/min cell are biased at the edge of conduction to minimize corner errors. PSPICE simulation results are given to verify the operation of the proposed median filtering circuit.
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Design of a high-voltage multiplier combined with Cockcroft-Walton voltage multipliers and switched-capacitor AC-AC converters
(2017-06-01)
Eguchi, Kei
;
Wongjan, Anan
;
Julsereewong, Amphawan
;
Do, Wanglok
;
Oota, Ichirou
In recent years, the non-thermal food processing is receiving much attention, because the non-thermal food processing can offer nutritious and fresh processed foods at low cost. In the non-thermal food processing, an underwater shockwave is utilized by discharging a high voltage in water. To generate the underwater shockwave, this paper proposes a novel high voltage multiplier designed by connecting a bipolar Cockcroft- Walton voltage multiplier (CWVM) with a switched-capacitor (SC) direct ac-ac converter in series. In the proposed multiplier, first, an ac input is amplified to double by the inductor-less ac-ac converter. Then, the output of the ac-ac converter is stepped-up again by the bipolar CWVM. Therefore, owing to the inductor-less series-connected bipolar topology, the proposed multiplier can achieve smaller size and higher gain than existing multipliers. Concerning the proposed multiplier with 26 × step-up gain, the operation principle and theoretical analysis are discussed in detail. Furthermore, the feasibility and effectiveness of the proposed multiplier are demonstrated by simulation program with integrated circuit emphasis (SPICE) simulations.
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A median filtering circuit using clocked CMOS neuron inverters for implantable electronic medical devices
(2017-01-01)
Eguchi, Kei
;
Wongjan, Anan
;
Julsereewong, Amphawan
;
Harada, Yujiro
;
Fujimoto, Kuniaki
In the past few years, implantable electronic medical devices are receiving much attention in the field of biomedical engineering. In the design of the implantable electronic medical devices, not only small size but also low power consumption are required to achieve long working-life. In this paper, we present a complementary metal oxide semiconductor (CMOS) median filtering circuit using clocked neuron CMOS inverters. The aim of this work is to develop a CMOS implementable preprocessing circuit realizing low power consumption for implantable electronic medical devices such as a retinal prosthesis system. By controlling the duty cycle of clock pulses in the clocked neuron CMOS inverters, the proposed median filtering circuit can suppress the through current of inverters. Therefore, the proposed circuit can realize smaller power consumption than conventional median filtering circuits. Moreover, without arithmetic logic circuits, the median filtering based on the binary search algorithm is achieved in the proposed circuit. Therefore, the proposed circuit can offer the simple circuit configuration. Concerning the proposed circuit, the operation principle and theoretical design method are discussed in detail. Furthermore, the effectiveness of the proposed circuit is confirmed by simulation program with integrated circuit emphasis (SPICE) simulations. The simulated results demonstrate that the proposed median filtering circuit can reduce about 37% power consumption from the conventional circuit using CMOS neuron inverters.
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Low-cost instrument for oscillometric blood pressure measurement
(2015-01-01)
Wongjan, Anan
;
Julsereewong, Prasit
;
Julsereewong, Amphawan
This article presents a technique for design and implementation of a lowcost microcontroller-controlled instrument for noninvasive blood pressure (NIBP) measurement based on oscillometric method. The proposed measuring device consists of a HEM-CR24 cuff for wrapping around a subject’s upper arm with automatic inflation, SCX pressure sensor, pneumatic subsystem, circuitry subsystem, PIC18F452 microcontroller, and LCD display module. The systolic blood pressure (SBP), diastolic blood pressure (DBP), and heart rate (HR) can be simultaneously measured and digitally displayed. The performance of the proposed instrument is confirmed through calibration results by using the BP Pump 2 NIBP monitor tester.
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Automatic control for oxygen intake via nasal cannula
(2010-12-01)
Chumlert, Deacha
;
Wongjan, Anan
;
Chitsakul, Kitiphol
In the present, oxygen supplying using nasal cannula is the first aide for a patient who has the problems in respiratory system by example in a newborn baby in which the incompetence of respiratory system on early days of birth is concerned. An indicator of this kind of symptom is physiological Jaundice, yellowish discoloration of the skin. Direct oxygen intake is a usual caretaking for this group of patients. Basically manual valve control of feeding oxygen by caretaker is a treatment by using pulse oximetry value as monitoring of effectiveness. This treatment is either time or labor consuming in a corona care unit. The purpose of this research is to develop an automatic control for oxygen intake. By studying the mechanism of arterial oxygen saturation in blood (SaO<inf>2</inf>) under the partial pressure of feeding oxygen (PiO <inf>2</inf>), the effective model can be applied as control value of oxygen for this group of patient.

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