亚洲欧美第一页_禁久久精品乱码_粉嫩av一区二区三区免费野_久草精品视频

蟲蟲首頁| 資源下載| 資源專輯| 精品軟件
登錄| 注冊

semantic-based

  • 基于FPGA的光纖光柵解調系統的研究

     波長信號的解調是實現光纖光柵傳感網絡的關鍵,基于現有的光纖光柵傳感器解調方法,提出一種基于FPGA的雙匹配光纖光柵解調方法,此系統是一種高速率、高精度、低成本的解調系統,并且通過引入雙匹配光柵有效地克服了雙值問題同時擴大了檢測范圍。分析了光纖光柵的測溫原理并給出了該方案軟硬件設計,綜合考慮系統的解調精度和FPGA的處理速度給出了基于拉格朗日的曲線擬合算法。 Abstract:  Sensor is one of the most important application of the fiber grating. Wavelength signal demodulating is the key techniques to carry out fiber grating sensing network, based on several existing methods of fiber grating sensor demodulation inadequate, a two-match fiber grating demodulation method was presented. This system is a high-speed, high precision, low-cost demodulation system. And by introducing a two-match grating effectively overcomes the problem of double value while expands the scope of testing. This paper analyzes the principle of fiber Bragg grating temperature and gives the software and hardware design of the program. Considering the system of demodulation accuracy and processing speed of FPGA,this paper gives the curve fitting algorithm based on Lagrange.

    標簽: FPGA 光纖光柵 解調系統

    上傳時間: 2014-07-24

    上傳用戶:caiguoqing

  • 8259 VHDL代碼

    a8259 可編程中斷控制 altera提供 The a8259 is designed to simplify the implementation of the interrupt interface  in 8088 and 8086  based microcomputer systems. The device is known as a programmable interrupt controller.  The a8259 receives and prioritizes up to 8 interrupts,  and in the cascade mode, this can be expanded up to  64 interrupts. An asynchronous reset and a clock input have been added to improve operation and reliability.

    標簽: 8259 VHDL 代碼

    上傳時間: 2014-11-29

    上傳用戶:zhyiroy

  • 移動Ad hoc環境下的LBS位置保護算法的研究

    傳統的基于位置信息的服務(LBS)的隱私保護需要LBS提供者(簡稱LSP)與用戶之間通過第三方作為中介來進行信息交換,但這種模式極易遭到攻擊者攻擊。為此提出一種基于K-匿名機制的隱形空間算法KABSCA(k-anonymity based spatial cloaking algorithm ),通過移動設備獨立建立一個分布式網絡直接與LSP通訊進而避免了第三方的安全威脅。仿真實驗顯示:使用這種算法,用戶可以享受到高質量的信息服務以及高度的隱私保護。

    標簽: hoc LBS 移動Ad 環境

    上傳時間: 2013-11-06

    上傳用戶:540750247

  • Modbus詳解(全書+PDF)第四章:以PC Based Controller設計Modbus通信程序

    Modbus詳解(全書+PDF)

    標簽: Modbus Controller Based

    上傳時間: 2013-10-09

    上傳用戶:lijinchuan

  • XAPP807-封裝最小的三態以太網MAC處理引擎

    The Tri-Mode Ethernet MAC (TEMAC) UltraController-II module is a minimal footprint,embedded network processing engine based on the PowerPC™ 405 (PPC405) processor coreand the TEMAC core embedded within a Virtex™-4 FX Platform FPGA. The TEMACUltraController-II module connects to an external PHY through Gigabit Media IndependentInterface (GMII) and Management Data Input/Output (MDIO) interfaces and supports tri-mode(10/100/1000 Mb/s) Ethernet. Software running from the processor cache reads and writesthrough an On-Chip Memory (OCM) interface to two FIFOs that act as buffers between thedifferent clock domains of the PPC405 OCM and the TEMAC.

    標簽: XAPP 807 MAC 封裝

    上傳時間: 2013-10-26

    上傳用戶:yuzsu

  • 基于以太網分布式的數據采集控制系統

    針對飛行模擬器座艙數據采集的復雜性,設計了一種基于以太網分布式的數據采集控制系統,該系統是RCM5700微處理器模塊上的以太網應用。在系統的基礎上具體討論了PoE技術的應用,在傳輸數據的網線上同時提供電流,提出并實現了一種包括輔助電源在內的完整可靠的PoE供電方案。設計采用美國國家半導體的LM5073和LM5576并根據不同的負載情況,進行穩定可靠的電壓轉換,以滿足數據采集電路的要求。實驗結果表明:該設計穩定可靠,滿足低于13 W的采集節點供電要求,提高了模擬器信號采集系統的通用性和標準化程度,避免了以往數據采集節點單獨繁瑣的電源設計。 Abstract:  Aiming at the complexity of large avion simulation and controlling,the simulator cabin distribute data collecting and control system was designed. This system is the application of RCM5700 on Ethernet. Based on this system,PoE technique that makes Ethernet can also provide power were expounded with emphasis and included FAUX design the PoE resolution was realized. To achieve the requirement of this system,LM5073 and LM5576 were used to DC-DC switch. From the data of experiment,the design filled the requirement of power-need of node whose power was lower than 13W. The application of the technique can advance the degree of simulation data collections currency and standardization and avoid designing additional power system.

    標簽: 以太網 分布式 數據采集 控制系統

    上傳時間: 2013-11-09

    上傳用戶:xyipie

  • 基于碼本映射的語音帶寬擴展算法研究

    在現代通信系統中,電話語音的頻帶被限制在300 Hz~4 kHz的范圍內,帶來了語音可懂度和自然度的降低。為了在不增加額外成本的前提下提高語音的可懂度和自然度,進行了電話語音頻帶擴展的研究。提出了一種改進的基于碼本映射的語音帶寬擴展算法:在碼本映射的過程中,使用加權系數來得到映射碼本。客觀測試結果表明,用此算法得到的寬帶語音的譜失真度比用一般的碼本映射降低至少2%。主觀測試結果表明,用此算法得到的寬帶語音具有更好的可懂度和自然度。 Abstract:  In modern communication systems, the bandwidth of telephone speech is limited from 300Hz to 4 kHz, which reduces the intelligibility and naturalness of speech. Telephone speech bandwidth extension is researched to get wideband speech and to improve its intelligibility and naturalness, without increasing extra costs. This paper put forward an improved algorithm of speech bandwidth extension based on codebook mapping. In the process of codebook mapping, weighted coefficients were used to get mapping codebook. Objective tests show that spectral distortion of wideband speech obtained by this algorithm reduces at least 2%, comparing to conditional codebook mapping. Subjective tests show that the wideband speech obtained by this algorithm has better intelligibility and naturalness.

    標簽: 映射 帶寬 擴展 語音

    上傳時間: 2014-12-29

    上傳用戶:15501536189

  • 改進SRC算法在人臉識別中的應用

    稀疏表示分類算法(Sparse Representation-based Classification,SRC)在人臉數據庫上有很高的識別性能。然而,對于姿態變化,SRC的識別效果并不理想。針對SRC算法不能解決測試樣本與訓練樣本存在偏移誤差的問題,本文提出了基于SRC的改進算法。該算法將每一類的訓練樣本單獨作為訓練字典,利用迭代校正和基于金字塔分層機構的運動偏移估計方法得到最終的偏移量,最后對校正后的測試樣本使用SRC算法實現分類。實驗結果表明該方法對于有偏移誤差的人臉圖像具有較好的魯棒性及識別率。

    標簽: SRC 算法 人臉識別 中的應用

    上傳時間: 2013-11-15

    上傳用戶:haiya2000

  • 如何構建一個1-Wire評估套件

    Abstract: The 1-Wire product family includes numerous devices that can be easily evaluated using a Windows®-based

    標簽: Wire 評估套件

    上傳時間: 2013-10-12

    上傳用戶:fudong911

  • XAPP996-雙處理器參考設計套件

    This is the Xilinx Dual Processor Reference Designs suite. The designs illustrate a few differentdual-core architectures based on the MicroBlaze™ and PowerPC™ processors. The designsillustrate various concepts described in the Xilinx White Paper WP262 titled, “DesigningMultiprocessor Systems in Platform Studio”. There are simple software applications includedwith the reference designs that show various forms of interaction between the two processors.

    標簽: XAPP 996 雙處理器 參考設計

    上傳時間: 2013-10-29

    上傳用戶:旭521

主站蜘蛛池模板: 清河县| 四平市| 社旗县| 繁昌县| 伊春市| 玉环县| 瑞丽市| 红安县| 米林县| 宁阳县| 长顺县| 五大连池市| 东丰县| 罗江县| 芜湖县| 临夏市| 娱乐| 乐平市| 秭归县| 获嘉县| 治县。| 东台市| 临江市| 宁乡县| 南开区| 正宁县| 蒙城县| 石泉县| 汝南县| 平远县| 长沙市| 曲阳县| 周宁县| 广宗县| 河东区| 柳州市| 广元市| 德江县| 盈江县| 渭南市| 新绛县|