基于DSP的医学图像压缩系统

介绍了JPEG2000图像压缩标准及其关键技术,重点描述了一个基于TI TMS320DM042 DSP芯片应用于医学图像压缩系统的可行性硬件方案,最终实现并优化了该方案.     

太阳能手机充电器的设计

设计了基于单片机的太阳能充电器,通过脉宽调制对手机电池充电曲线进行模拟,并且用单片机对充电、放电过程进行智能控制,从而提高太阳能电池输出功率及手机电池的使用效率,达到延长电池使用寿命的目的。     

The Dynamic Behavioral Model of RF Power Amplifiers With the Modified ANFIS

The adaptive neuro-fuzzy inference system (ANFIS) has been widely used for modeling different kinds of nonlinear systems including RF power amplifiers (PAs). The modified ANFIS (MANFIS) architecture is simpler than that of ANFIS, but with nearly the same performance for modeling nonlinear systems. In this paper, the MANFIS is applied to model RF PAs with memory effects. The simulation and experimental results both in the time and frequency domains show that this model has good modeling accuracy and the characteristics of faster convergence and lower computational complexity compared with the ANFIS model. The normalized mean squared errors of the MANFIS model are slightly lower than those of some other neural network models such as the real-valued time delay neural network, radial basis-function neural network, etc. Finally, the MANFIS model is successfully used in a digital predistortion system, which can provide over 10- dB adjacent channel leakage ratio improvement for three-carrier wideband code division multiple access signals.     

Theoretical approach to estimate laser process parameters for drilling in crystalline silicon

This paper presents a simple method for estimating the ablation rate during drilling processes in crystalline silicon wafers. Using data from literature, the physical process of material heating, melting, and ejection can be estimated on a time scale and leads to a temporal separation of the pulse duration in two parts. The latter one offers a theoretical determination of the expected average ablation rate. The results of this approximation coincide with experimental values and offer solutions to increase drilling efficiency. The experiments were done with a q‐switched solid‐state laser emitting at 1064 nm wavelength at pulse durations between 810 ns and 1440 ns. Copyright © 2010 John Wiley & Sons, Ltd.