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.
上傳時(shí)間： 2014-11-29
上傳用戶：zhyiroy
傳統(tǒng)的基于位置信息的服務(wù)（LBS）的隱私保護(hù)需要LBS提供者（簡(jiǎn)稱LSP）與用戶之間通過(guò)第三方作為中介來(lái)進(jìn)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(jī)制的隱形空間算法KABSCA（k-anonymity based spatial cloaking algorithm ），通過(guò)移動(dòng)設(shè)備獨(dú)立建立一個(gè)分布式網(wǎng)絡(luò)直接與LSP通訊進(jìn)而避免了第三方的安全威脅。仿真實(shí)驗(yàn)顯示:使用這種算法，用戶可以享受到高質(zhì)量的信息服務(wù)以及高度的隱私保護(hù)。
標(biāo)簽： hoc LBS 移動(dòng)Ad 環(huán)境
上傳時(shí)間： 2013-11-06
上傳用戶：540750247
Modbus詳解(全書(shū)+PDF)
標(biāo)簽： Modbus Controller Based
上傳時(shí)間： 2013-10-09
上傳用戶：lijinchuan
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.
上傳時(shí)間： 2013-10-26
上傳用戶：yuzsu
針對(duì)飛行模擬器座艙數(shù)據(jù)采集的復(fù)雜性，設(shè)計(jì)了一種基于以太網(wǎng)分布式的數(shù)據(jù)采集控制系統(tǒng)，該系統(tǒng)是RCM5700微處理器模塊上的以太網(wǎng)應(yīng)用。在系統(tǒng)的基礎(chǔ)上具體討論了PoE技術(shù)的應(yīng)用，在傳輸數(shù)據(jù)的網(wǎng)線上同時(shí)提供電流，提出并實(shí)現(xiàn)了一種包括輔助電源在內(nèi)的完整可靠的PoE供電方案。設(shè)計(jì)采用美國(guó)國(guó)家半導(dǎo)體的LM5073和LM5576并根據(jù)不同的負(fù)載情況，進(jìn)行穩(wěn)定可靠的電壓轉(zhuǎn)換，以滿足數(shù)據(jù)采集電路的要求。實(shí)驗(yàn)結(jié)果表明：該設(shè)計(jì)穩(wěn)定可靠，滿足低于13 W的采集節(jié)點(diǎn)供電要求，提高了模擬器信號(hào)采集系統(tǒng)的通用性和標(biāo)準(zhǔn)化程度，避免了以往數(shù)據(jù)采集節(jié)點(diǎn)單獨(dú)繁瑣的電源設(shè)計(jì)。 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(biāo)簽： 以太網(wǎng) 分布式 數(shù)據(jù)采集 控制系統(tǒng)
上傳時(shí)間： 2013-11-09
上傳用戶：xyipie
在現(xiàn)代通信系統(tǒng)中，電話語(yǔ)音的頻帶被限制在300 Hz～4 kHz的范圍內(nèi)，帶來(lái)了語(yǔ)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(yǔ)音的可懂度和自然度，進(jìn)行了電話語(yǔ)音頻帶擴(kuò)展的研究。提出了一種改進(jìn)的基于碼本映射的語(yǔ)音帶寬擴(kuò)展算法：在碼本映射的過(guò)程中，使用加權(quán)系數(shù)來(lái)得到映射碼本。客觀測(cè)試結(jié)果表明，用此算法得到的寬帶語(yǔ)音的譜失真度比用一般的碼本映射降低至少2%。主觀測(cè)試結(jié)果表明，用此算法得到的寬帶語(yǔ)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(biāo)簽： 映射 帶寬 擴(kuò)展 語(yǔ)音
上傳時(shí)間： 2014-12-29
上傳用戶：15501536189
稀疏表示分類算法（Sparse Representation-based Classification，SRC）在人臉數(shù)據(jù)庫(kù)上有很高的識(shí)別性能。然而，對(duì)于姿態(tài)變化，SRC的識(shí)別效果并不理想。針對(duì)SRC算法不能解決測(cè)試樣本與訓(xùn)練樣本存在偏移誤差的問(wèn)題，本文提出了基于SRC的改進(jìn)算法。該算法將每一類的訓(xùn)練樣本單獨(dú)作為訓(xùn)練字典，利用迭代校正和基于金字塔分層機(jī)構(gòu)的運(yùn)動(dòng)偏移估計(jì)方法得到最終的偏移量，最后對(duì)校正后的測(cè)試樣本使用SRC算法實(shí)現(xiàn)分類。實(shí)驗(yàn)結(jié)果表明該方法對(duì)于有偏移誤差的人臉圖像具有較好的魯棒性及識(shí)別率。
標(biāo)簽： SRC 算法 人臉識(shí)別 中的應(yīng)用
上傳時(shí)間： 2013-11-15
上傳用戶：haiya2000
Abstract: The 1-Wire product family includes numerous devices that can be easily evaluated using a Windows®-based
標(biāo)簽： Wire 評(píng)估套件
上傳時(shí)間： 2013-10-12
上傳用戶：fudong911
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(biāo)簽： XAPP 996 雙處理器 參考設(shè)計(jì)
上傳時(shí)間： 2013-10-29
上傳用戶：旭521
The LPC2292/2294 microcontrollers are based on a 16/32-bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, together with 256 kB of embedded high-speed flash memory. A 128-bit wide memory interface and a unique accelerator architecture enable 32-bit code execution at the maximum clock rate. For critical code size applications, the alternative 16-bit Thumb mode reduces code by more than 30 pct with minimal performance penalty. With their 144-pin package, low power consumption, various 32-bit timers, 8-channel 10-bit ADC, 2/4 (LPC2294) advanced CAN channels, PWM channels and up to nine external interrupt pins these microcontrollers are particularly suitable for automotive and industrial control applications as well as medical systems and fault-tolerant maintenance buses. The number of available fast GPIOs ranges from 76 (with external memory) through 112 (single-chip). With a wide range of additional serial communications interfaces, they are also suited for communication gateways and protocol converters as well as many other general-purpose applications. Remark: Throughout the data sheet, the term LPC2292/2294 will apply to devices with and without the /00 or /01 suffix. The suffixes /00 and /01 will be used to differentiate from other devices only when necessary.
標(biāo)簽： lpc datasheet 2292 2294
上傳時(shí)間： 2014-12-30
上傳用戶：aysyzxzm
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