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1.
基于DSP的实时语音压缩   总被引:1,自引:1,他引:1  
DSP(数字信号处理器)具有强大的数字信号处理能力,在其应用系统中,大多由ADC和DAC通道来完成对模拟信号的数字化处理。本文介绍了一种集成ADC和DAC于一体的TLC320AD50C模拟接口电路与TMS320VC5416定点DSP接口电路的硬件设计方法,并结合一个具体的软件实例说明主从模式下软件的实现方法。  相似文献   

2.
DSP应用系统中,大多有ADC和DAC通道。本文介绍一种集成了ADC和DAC于一体的TLC320AC01模拟接口电路与TMS320VC5402定点DSP的接口电路的硬件设计方法。该设计采用2片TLC320AC01芯片,工作于主从模式。最后给出一个软件实例说明主从模式下软件的实现方法。  相似文献   

3.
DSP应用系统中,大多有ADC和DAC通道.本文介绍一种集成了ADC和DAC于一体的TLC320AC01模拟接口电路与TMS320VC5402定点DSP的接口电路的硬件设计方法.该设计采用2片TLC320AC01芯片,工作于主从模式.最后给出一个软件实例说明主从模式下软件的实现方法.  相似文献   

4.
针对以往光纤气体传感器模拟信号处理电路的不足,基于DSP芯片TMS320F2812设计并实现了一种嵌入式光纤气体传感器信号处理系统;重点描述了硬件实现方法及其软件开发,其硬件主要由接口电路、高精度运放器OPA139P,32位高性能定点DSP(数字信号处理器)TMS320F2812和D/A转换芯片DAC7625组成;软件部分的主要功能是产生交流信号,完成两路输入信号滤波,相敏检波,相除、线性化处理等工作.  相似文献   

5.
俞兴明 《福建电脑》2009,25(9):11-12
本文介绍了几种基于数字信号处理器(DSP)的正弦波产生法。给出了这些产生正弦信号的算法和主要源程序代码或流程,同时给出了TMS320VC5402DSP与DA转换器TLC320ADC50的接口电路。经过程序的实际运行.得出了软件仿真和硬件仿真所得的正弦波形。最后,分析了各种方法的优缺点,讨论了调整输出信号频率的方法。  相似文献   

6.
根据工作需要开发了基于PC机、8031单片机的计算辅助测试仪。测试机箱由单片机、高精度任意波形发生器、波形采样器和程控电源等部件组成。测试机箱与PC机间经光电隔离RS232接口传送信息和数据,避免了PC机干扰,机箱使用灵活方便。用C语言开发了测试语言,将DSP数字信号处理技术用于ADC、DAC测试取得了良好效果,已实现14位以下ADC、DAC的自动测试。为实现更高速度、精度的ADC和DAC测试,开发了IEEE488接口板,控制高级智能仪器对其测试。利用美国ESI44PLUS激光修调机硬、软件资源,结合ADC、DAC测试,实现了对12位以下ADC、DAC的动态修调,保证其电气性能指标。  相似文献   

7.
HPI的原理及其在DSP与单片机接口中的应用   总被引:5,自引:0,他引:5  
主机接口(HPI)是TI公司数字信号处理器(DSP)中用于和主机(通常是微处理器)进行双向数据通信的8位并行接口。本文介绍了HPI的基本原理,并给出了数字信号处理器TMS320C5402和单片机MSP430X33X的硬件接口电路和软件编程。  相似文献   

8.
基于DSP的心电监护模块设计   总被引:3,自引:0,他引:3  
美国德州仪器公司(TI)的TMS320C2XX系列定点数字信号处理器DSP具有强大的实时处理能力和高度集成的片上硬件资源,使用灵活方便,在数字信号处理领域得到了广泛的应用。讨论了该DSP系列中的TMS320F206在心电监护模块中的应用,包括硬件接口和软件编程。  相似文献   

9.
管晓虎  李雪莲  时谦  周伟 《测控技术》2013,32(12):147-150
针对高校微机继电保护课程,提出了一种基于TMS320F28335+EPM570F256C4+PC机的微机继电保护教学实验平台,以充分发挥DSP在数字信号处理及控制方面的优势,CPLD组合逻辑、译码及I/O扩展功能。详细介绍了平台的组成和保护装置接口电路的设计,其中包括DSP与CPLD接口电路、模拟量输入转换电路、开关量输入输出电路、测频电路以及人机接口电路。该平台配置相应模块化保护软件即可满足微机继电保护教学中,学生对装置硬件构成、数字算法、继电保护原理的感性理解和认识。  相似文献   

10.
介绍了与8031单片微机配套的A/D、D/A转换器ADC 0809和DAC 0832的工作原理和具体使用,具体讨论了ADC 0809、DAC 0832与8031最小系统的接口,并给出了实用的硬件电路和软件。  相似文献   

11.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

12.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

13.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

14.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

15.
基于复小波噪声方差显著修正的SAR图像去噪   总被引:4,自引:1,他引:3  
提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。  相似文献   

16.
Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.  相似文献   

17.
正The demands of a rapidly advancing technology for faster and more accurate controllers have always had a strong influence on the progress of automatic control theory.In recent years control problems have been arising with increasing frequency in widely different areas,which cannot be addressed using conventional control techniques.The principal reason for this is the fact that a highly competitive economy is forcing systems to operate in regimes where  相似文献   

18.
正Aim The Journals of Zhejiang University-SCIENCE(A/B/C)areedited by the international board of distinguished Chinese andforeign scientists,and are aimed to present the latest devel-opments and achievements in scientific research in China andoverseas to the world’s scientific circles,especially to stimulateand promote academic exchange between Chinese and for-eign scientists everywhere.  相似文献   

19.
The relative concentrations of different pigments within a leaf have significant physiological and spectral consequences. Photosynthesis, light use efficiency, mass and energy exchange, and stress response are dependent on relationships among an ensemble of pigments. This ensemble also determines the visible characteristics of a leaf, which can be measured remotely and used to quantify leaf biochemistry and structure. But current remote sensing approaches are limited in their ability to resolve individual pigments. This paper focuses on the incorporation of three pigments—chlorophyll a, chlorophyll b, and total carotenoids—into the LIBERTY leaf radiative transfer model to better understand relationships between leaf biochemical, biophysical, and spectral properties.Pinus ponderosa and Pinus jeffreyi needles were collected from three sites in the California Sierra Nevada. Hemispheric single-leaf visible reflectance and transmittance and concentrations of chlorophylls a and b and total carotenoids of fresh needles were measured. These data were input to the enhanced LIBERTY model to estimate optical and biochemical properties of pine needles. The enhanced model successfully estimated reflectance (RMSE = 0.0255, BIAS = 0.00477, RMS%E = 16.7%), had variable success estimating transmittance (RMSE = 0.0442, BIAS = 0.0294, RMS%E = 181%), and generated very good estimates of carotenoid concentrations (RMSE = 2.48 µg/cm2, BIAS = 0.143 µg/cm2, RMS%E = 20.4%), good estimates of chlorophyll a concentrations (RMSE = 10.7 µg/cm2, BIAS = − 0.992 µg/cm2, RMS%E = 21.1%), and fair estimates of chlorophyll b concentrations (RMSE = 7.49 µg/cm2, BIAS = − 2.12 µg/cm2, RMS%E = 43.7%). Overall root mean squared errors of reflectance, transmittance, and pigment concentration estimates were lower for the three-pigment model than for the single-pigment model. The algorithm to estimate three in vivo specific absorption coefficients is robust, although estimated values are distorted by inconsistencies in model biophysics. The capacity to invert the model from single-leaf reflectance and transmittance was added to the model so it could be coupled with vegetation canopy models to estimate canopy biochemistry from remotely sensed data.  相似文献   

20.
This article discusses the history and design of the special versions of the bombe key-finding machines used by Britain’s Government Code & Cypher School (GC&CS) during World War II to attack the Enigma traffic of the Abwehr (the German military intelligence service). These special bombes were based on the design of their more numerous counterparts used against the traffic of the German armed services, but differed from them in important ways that highlight the adaptability of the British bombe design, and the power and flexibility of the diagonal board. Also discussed are the changes in the Abwehr indicating system that drove the development of these machines, the ingenious ways in which they were used, and some related developments involving the bombes used by the U.S. Navy’s cryptanalytic unit (OP-20-G).  相似文献   

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