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Measurement of power output levels of diagnostic and therapeutic ultrasound equipment has become increasingly important to determine exact patient exposure levels in case a potential risk exists to the patient and to ascertain whether the ultrasound devices are performing satisfactorily. The objective of this work was to establish standards for ultrasonic power in Thailand by developing a primary...
Charcot-Marie-Tooth (CMT) is a hereditary neurological disorder which causes muscle weakness and atrophy in limbs. Assistive devices are required by CMT sufferers to enhance their mobility. To build assistive-devices for these sufferers, it is necessary to obtain their limb size and shape in 3D. The current desirable 3D modelling accuracy to enable the construction of an orthotic device is 1–2 mm...
In this paper we present an implementation and performance investigation of a phase signal generator for use in mixed-signal embedded test. The generator consists of a circular 1×N-bit memory and a time-mode filter. The memory is loaded with a phase-modulated sigma-delta encoded bit stream generated in software. Due to its digital nature, the generator except for the time-mode filter is fully synthesizable...
Modeling and simulation play a key-role in computer-assisted design of ultrasonic sensors. The accuracy of those numerical or analytical models highly depends on the material dataset chosen as well as on the digitized simplified geometry. Thus, researchers worked on techniques how to measure material datasets of piezoceramics or passive materials (i.e. polymers) for use in simulation [1] [2]. Most...
Radio and television industry of China has an extremely rapid development, with the equipment digitization increasing constantly, an effective analysis on audio indicators of new equipments digitized becomes a problem radio and television testers facing. The author introduces the key technical indicators of analog audio and digital audio, as well as the importance of relevant indicators, whilst proposes...
Continuous casting technology is a process of heat transferring from liquid steel to solid billet. During this process, temperature of slab surface is one of the most important parameters for controlling. It is one of the main reasons that to optimize casting speed, to determine intensity of the second cold and determine liquid depth. Therefore, it becomes an important research direction that controlling...
Subpixel is a key technology of image processing technology. It can achieve positioning better than entire pixel precision to the target. Against the shortcoming of slow speed of general Zernike moment subpixel location method, proposed an improved Sobel-Zernike moment positioning method in the software algorithms of sheath and insulation materials thickness image measurement system, improved the...
It is a tempting application for the measurement system based on sub-pixel image processing. The paper focuses on several factors that may impact on the accuracy of measurement system. And the paper finds some good methods to solve these problems. Several Algorithms, such as principal axis transform, multi-scale gradient and general sub-pixel image processing, are mentioned in the paper. In addition,...
The unevenness degree of flow distribution is a very important performance index for spray oil duct. According to its test requirements and technical characteristics, this paper proposes to detect the uneven distribution of spray nozzle flow rate by digital image processing technology, designs and develops auto-measurement instrument, and selects a standard component of spray oil duct to test the...
In order to solve the technical problem of the light screen disturbed incorrect signals due to external environmental interference, a digital signal processing algorithm is put forward in this paper. The band-pass filter is used to filter out signals of mosquitoes, shock wave and random noise in order to improve the reliability of the test system by analyzing the difference of frequency between the...
The current medical equipments mostly adopt SCM to fulfill on control system, which commonly reveals some problems like tedious operation, unintuitive of displaying, poor data sharing and so on. Upon these problems, the passage tells us that FPGA digital signal processing board and ARM computer board have worked out a medical image diagnostic data acquisition equipment which is really safe and effective,...
In speech synthesis system driven by visual speech, many irrelevant and redundant features will lessen the lipreading recognition result. So it is important to select lip features with stronger discriminate performance. Feature selection algorithm based on binary particle swarm optimization (BPSO) and support vector machines (SVM) is used to select the “optimal” lip feature subset. Feature subset...
Large railway maintenance machinery plays a significant role in ensuring the railway running safety. Video monitoring system for monitoring the process of maintenance and construction such as the tamping machine is an important research topic to achieve the goal of supervising the working state and working quality. A video monitoring system based on TMS320DM642 DSP, local network and GPRS is developed...
Aimed at the measurement of the volume for a small flying objects, a measuring method of the volume for the flying objects using single screen was presented in this paper. Two light screen targets were used to measure the speed of the flying objects, the volume information of the rotational symmetry flying object was got by means of the analog signal outputted from one of the light screen targets...
This paper presents controller design based on state-space pole-placement method for a non-linear dynamic system described by a double-parallel inverted pendulum i.e. two identical inverted pendulums on carts coupled by a spring. The state space model of this multivariable, dynamic, unstable and strongly coupled system developed elsewhere is taken and controller design task using pole placement method...
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