TMS32010数字信号处理器的系统设计与应用

一、TMS32010主要特点 TMS32010是一种新型的数字处理芯片,内部有16×16的硬件乘法器、32比特字长的算逻运算单元ALU、144个数据寄存器以及移位寄存器、辅助寄存器、堆栈和指令计数器等。TMS32010封装在40腿的DIP中,它的寻址能力为4K,对外数据字长为16比特。 TMS32010共有60条指令,可归纳为6类,即累加器操作指令18条;辅助寄存器及数据器指针操作指令7条;程序分支指令13条;T寄存器、P寄存器及乘法指令8条;中断控制及状态寄存器控制指令9条;I/O及存贮器操作指令5条。TMS32010的机器周期为200ns。     

用单板机对供电电网谐波测试

本文阐述一种供电电网谐波测试方法。采用Z—80单板机可以迅速得到供电电网各项谐波参数。文中介绍了FFT变换程序、重排序的新方法和三角函数查表法等。采用上述措施后,该装置具有高精度和高速度,为制造各种谐波分析仪和实现供电电网抑制谐波的实时控制提供了可能性。     

边扫描边跟踪雷达数据处理性能分析

在边扫描边跟踪雷达数据处理系统的研制和外场实验过程中，方案的选定和工作参数的设置与调整都应以最终的航迹效果最佳为准则。本文用离散的 Ｍａｒｋｏｖ过程对实现ＴＷＳ雷达数据处理系统的跟踪过程进行了理论分析。对各种不同的真实航迹概率进行了推导并给出了Ｎ次扫拉的航迹保持概率和平均跟踪点数的公式与曲线。     

多通道相量信号实时测量的一种方法

本文给出一种实时测量相量信号的新方法。由于采用了多项式逼近和计算机辅助测试技术,该法此常用的模拟电路方法具有显著的优点。文中叙述了此法的工作原理、系统组成、程序设计和误差分析等,并举例说明了该法的有效性。     

用于语音识别的鲁棒自适应麦克风阵列算法

对现实环境中存在的混响以及非平稳干扰语音信源等因素导致的算法性能下降,提出了一种用于语音识别的鲁棒旁瓣对消算法。讨论了旁瓣对消算法在自适应麦克风阵列中的应用,分析了算法在不同的混响条件下、不同的干扰源的噪声抑制能力。该算法通过分帧处理将输入信号划分为一系列短时平稳的信号片段。根据当前帧的信噪比决定自适应滤波器的权系数更新方式。采用一定的范数约束来限制自适应滤波器权系数的误调整。实验结果表明该麦克风阵列在混响的现实环境中能够有效抑制平稳噪声源和交叠谈话背景干扰,提高了语音识别器的抗噪性能。     

带有频谱补偿的基频修改算法

针对当前多数在基于拼接的语音合成系统中使用的基频修改算法缺少对频谱进行补偿的情况,提出了一种带有频谱补偿的基频修改算法.在传统基音同步叠加(PSOLA)算法的基础上,以共振峰参数和频谱倾斜参数描述频谱特性,通过对频谱参数进行预测及修改,在修改基频的同时,有效地补偿了频谱特性.频谱参数的预测公式由各基频下的条件概率密度函数导出,频谱参数的修改通过正弦模型实现.实验表明,对于不同的汉语元音、基频修改因子和听者,在平均86.25%的情况下,该算法较传统PSOLA算法能够获得更接近自然音质的语音.     

小卫星柔性测试床设计与实现

分析了小卫星地面综合测试系统的特点和功能,通过对几种型号小卫星系统的研究,给出了柔性测试床的软硬件体系结构,阐述了柔性测试床星上和地面两部分的设计思想,主要介绍了通信参数的动态配置、TM数据信号的定义与解析的实现方法。小卫星柔性测试床已成功应用于三颗小卫星系统的研制,并取得了明显的应用效果。     

Protein kinase C and phospholipase D: intimate interactions in intracellular signaling

Diacylglycerol (DAG) was discovered as a potent lipid second messenger with protein kinase C (PKC) as its major cellular target more than 25 years ago. There is increasing evidence of significant complexity within lipid signaling, and the classical DAG-PKC model no longer stands alone but is part of a larger bioactive lipid universe involving glycerolipids and sphingolipids. Multiple layers of regulation exist among PKC- and DAG-metabolizing enzymes such as phosphatidylcholine (PC)-specific phospholipase D, and cross-talk exists between the glycerolipid and sphingolipid pathways, with PKC at the center. Currently, there is intense interest in the question of whether DAG derived from PC can function as a lipid second messenger and regulate PKC analogous to DAG derived from phosphatidylinositol-4,5-bisphosphate (PIP₂). To address these issues and incorporate DAG-PKC and other signaling pathways into an expanded view of cell biology, it will be necessary to go beyond the classical approaches and concepts.Received 29 November 2004; received after revision 18 January 2005; accepted 4 March 2005This work is dedicated to the memory of Dr. Yasutomi Nishizuka, the discoverer of protein kinase C, who was both a gentleman and a scientist.     

Cellular responses to mild heat stress

Since its discovery in 1962 by Ritossa, the heat shock response has been extensively studied by a number of investigators to understand the molecular mechanism underlying the cellular response to heat stress. The most well characterized heat shock response is induction of the heat shock proteins that function as molecular chaperones and exert cell cycle regulatory and anti-apoptotic activities. While most investigators have focused their studies on the toxic effects of heat stress in organisms such as severe heat stress-induced cell cycle arrest and apoptosis, the cellular response to fever-ranged mild heat stress has been rather underestimated. However, the cellular response to mild heat stress is likely to be more important in a physiological sense than that to severe heat stress because the body temperature of homeothermic animals increases by only 1–2°C during febrile diseases. Here we provide information that mild heat stress does have some beneficial role in organisms via positively regulating cell proliferation and differentiation, and immune response in mammalian cells.Received 14 May 2004; received after revision 2 August 2004; accepted 16 August 2004     

Oxygen intervention in the regulation of gene expression: the photosynthetic bacterial paradigm

The means by which oxygen intervenes in gene expression has been examined in considerable detail in the metabolically versatile bacterium Rhodobacter sphaeroides. Three regulatory systems are now known in this organism, which are used singly and in combination to modulate genes in response to changing oxygen availability. The outcome of these regulatory events is that the molecular machinery is present for the cell to obtain energy by means that are best suited to prevailing conditions, while at the same time maintaining cellular redox balance. Here, we explore the dangers associated with molecular oxygen relative to the various metabolisms used by R. sphaeroides, and then present the most recent findings regarding the features and operation of each of the three regulatory systems which collectively mediate oxygen control in this organism.Received 26 June 2003; received after revision 30 July 2003; accepted 8 August 2003