The 4.0 kbit/s speech codec described in this paper is based on a Frequency Domain Interpolative (FDI) coding technique, which belongs to the class of prototype waveform Interpolation (PWI) coding techniques. The codec also has an integrated voice activity detector (VAD) and a noise reduction capability. The input signal is subjected to LPC analysis and the prediction residual is separated into a slowly evolving waveform (SEW) and a rapidly evolving waveform (REW) components. The SEW magnitude component is quantized using a hierarchical predictive vector quantization approach. The REW magnitude is quantized using a gain and a sub-band based shape. SEW and REW phases are derived at the decoder using a phase model, based on a transmitted measure of voice periodicity. The spectral (LSP) parameters are quantized using a combination of scalar and vector quantizers. The 4.0 kbits/s coder has an algorithmic delay of 60 ms and an estimated floating point complexity of 21.5 MIPS. The performance of this coder has been evaluated using in-house MOS tests under various conditions such as background noise. channel errors, self-tandem. and DTX mode of operation, and has been shown to be statistically equivalent to ITU-T (3.729 8 kbps codec across all conditions tested.
標(biāo)簽： frequency-domain interpolation performance Design kbit_s speech coder based and of
上傳時(shí)間： 2018-04-08
上傳用戶(hù)：kilohorse
Many good textbooks exist on probability and random processes written at the under- graduate level to the research level. However, there is no one handy and ready book that explains most of the essential topics, such as random variables and most of their frequently used discrete and continuous probability distribution functions; moments, transformation, and convergences of random variables; characteristic and generating functions; estimation theory and the associated orthogonality principle; vector random variables; random processes and their autocovariance and cross-covariance functions; sta- tionarity concepts; and random processes through linear systems and the associated Wiener and Kalman filters.
標(biāo)簽： Probability Processes Random and
上傳時(shí)間： 2020-05-31
上傳用戶(hù)：shancjb
This reference design describes the design of a 3-phase AC induction vector control drive with position encoder coupled to the motor shaft. It is based on Motorola’s DSP56F805 dedicated motor control device. AC induction motors, which contain a cage, are very popular in variable speed drives. They are simple, rugged, inexpensive and available at all power ratings. Progress in the field of power electronics and microelectronics enables the application of induction motors for high-performance drives, where traditionally only DC motors were applied. Thanks to sophisticated control methods, AC induction drives offer the same control capabilities as high performance four-quadrant DC drives.
標(biāo)簽： Reference Designer Manual Phase DRM 023 AC
上傳時(shí)間： 2020-06-10
上傳用戶(hù)：shancjb
General paradigm in solving a computer vision problem is to represent a raw image using a more informative vector called feature vector and train a classifier on top of feature vectors collected from training set. From classification perspective, there are several off-the-shelf methods such as gradient boosting, random forest and support vector machines that are able to accurately model nonlinear decision boundaries. Hence, solving a computer vision problem mainly depends on the feature extraction algorithm
標(biāo)簽： Convolutional Networks Neural Guide to
上傳時(shí)間： 2020-06-10
上傳用戶(hù)：shancjb
基于TMS320F28035芯片為控制核心的空間矢量異步電機(jī)變頻器 我們?cè)O(shè)計(jì)的異步電機(jī)變頻調(diào)速器以TMS320F28035芯片為控制核心，通過(guò)輸出三相PWM波控制智能功率模塊IPM驅(qū)動(dòng)三相異步電機(jī)。我們使用空間矢量SVPWM算法，并對(duì)其進(jìn)行了優(yōu)化。采用檢測(cè)反電勢(shì)的方法省去了昂貴的光電編碼器，大大節(jié)省了成本。同時(shí)開(kāi)創(chuàng)性的研發(fā)了自動(dòng)根據(jù)運(yùn)行環(huán)境調(diào)節(jié)的自適應(yīng)變頻算法，使我們的變頻調(diào)速器可以在電網(wǎng)條件惡劣的鄉(xiāng)村山區(qū)工作，由此該變頻器已被一家民用水泵生產(chǎn)企業(yè)預(yù)訂。關(guān)鍵字 變頻器 TMS320f28035 IPM SVPWM In our design, the asynchronous machine inverter based on the chip of TMS320F28035 drives the three-Phase asynchronous machine by sending three-phase PWM waves to the IPM, which is short for the Intelligent-Power-Module. The SVPWM (space vector pulse width modulation) strategy is applied to our control algorithm and we optimize it mainly in two aspects. Firstly the inverter detects the speed by measuring the Back EMF instead of installing an expensive photoelectric encoder for costs reduction.
標(biāo)簽： tms320f28035 芯片
上傳時(shí)間： 2022-05-08
上傳用戶(hù)：zhanglei193
直接調(diào)制將基帶信號(hào)直接轉(zhuǎn)換為射頻信號(hào)，不需要二次頻率變換，與上變頻方式相比系統(tǒng)結(jié)構(gòu)簡(jiǎn)單，降低了對(duì)濾波器的要求，具有體積小，重量輕，成本低等明顯的優(yōu)點(diǎn).1/Q正交調(diào)制的關(guān)鍵指標(biāo)是誤差矢量（EVM：Error Vector Magnitude）.本文研究的是微波波段的直接調(diào)制技術(shù)。利用基帶對(duì)L波段和s波段幾個(gè)不同的載波進(jìn)行直接調(diào)制。首先，在闡述1/Q正交調(diào)制基本原理的基礎(chǔ)上，通過(guò)對(duì)誤差矢量和鄰近信道功率泄漏的詳細(xì)分析，定性、定量地討論了各種非理想電路因素（如相位不平衡、幅度不平衡、直流偏差等）對(duì)調(diào)制器性能的影響；其次，介紹了鎖相環(huán)的工作原理和基本組成部分，包括鎖相環(huán)的設(shè)計(jì)和環(huán)路濾波器的設(shè)計(jì)，特別詳述了電荷泵鎖相頻率源；第三，介紹了采用直接調(diào)制技術(shù)模擬衛(wèi)星信號(hào)的射頻前端的設(shè)計(jì)；最后，對(duì)整個(gè)直接射頻調(diào)制系統(tǒng)進(jìn)行測(cè)試，結(jié)果基本上達(dá)到了課題要求。關(guān)鍵詞：微波鎖相環(huán)，相位噪聲，直接調(diào)制
標(biāo)簽： 射頻調(diào)制
上傳時(shí)間： 2022-06-20
上傳用戶(hù)：
簡(jiǎn)介本文檔介紹了如何使用dsPIC30F數(shù)字信號(hào)控制器（Digital Signal Controller，DSC）控制正弦電流來(lái)驅(qū)動(dòng)具有位置傳感器的永磁同步電機(jī)（Permanent Mag-net Synchronous Motor，PMSM）.電機(jī)控制固件使用dsPIC30F外設(shè)，而數(shù)學(xué)運(yùn)算則由DSP引擎完成。為充分利用dsPIC30F的特殊DSP運(yùn)算性能，固件采用C語(yǔ)言編寫(xiě)，只有某些子程序采用匯編語(yǔ)言編寫(xiě)。應(yīng)用特性·使用空間矢量調(diào)制（Space Vector Modulation，SVM）方法產(chǎn)生用于驅(qū)動(dòng)PMSM電機(jī)各相的正弦電流·正弦電壓與PMSM電機(jī)轉(zhuǎn)子位置同步·四象限運(yùn)行，可實(shí)現(xiàn)正向、反向和制動(dòng)運(yùn)行·基于數(shù)字比例一積分一微分（Proportional Integral Derivative，PID）控制的閉環(huán)轉(zhuǎn)速控制·相位超前技術(shù)可實(shí)現(xiàn)更寬的調(diào)速范圍·由dsPICODSC的DSP引擎實(shí)現(xiàn)小數(shù)數(shù)學(xué)運(yùn)算
上傳時(shí)間： 2022-07-05
上傳用戶(hù)：
Agenda■Motor Types Overview■BLDC Motor Applications■Comparison of DC to Brushless DC Motors■Hall Sensors■Six-Step Commutation■Sensorless Commutation with Back-EMFVector Motor Control basicsClosed-Loop Speed Control■Introduction to BLDC Motor Control Evaluation Kit■SummaryAll the popular motor types have their specific applications, and all can be controlled with microcontrollers.We wll talk about Brushless DC motors as it is the fast growing motor type today.Motors used in modern Air conditioners, home appliances, tools, even electric bikes are all going to Brushless DC.
標(biāo)簽： bldc 電機(jī)驅(qū)動(dòng)
上傳時(shí)間： 2022-07-07
上傳用戶(hù)：
VIP專(zhuān)區(qū)-嵌入式/單片機(jī)編程源碼精選合集系列（105）資源包含以下內(nèi)容：1. 凌陽(yáng)公司機(jī)sunplus1002在這個(gè)芯片下.2. 基于pdiusbd12的c51單片機(jī)驅(qū)動(dòng)程序.3. 凌陽(yáng)公司機(jī)sunplus1002在這個(gè)芯片做為機(jī)頂盒主芯片下的嵌入式字體庫(kù)。.4. 常見(jiàn)datasheet中文版--- 很多人不大習(xí)慣讀英文的datasheet.5. 倒車(chē)?yán)走_(dá)系統(tǒng)的研究與設(shè)計(jì)：系統(tǒng)設(shè)計(jì)中采用了模塊設(shè)計(jì)思想.6. TMS320VC5509設(shè)備端USB設(shè)備驅(qū)動(dòng)程序源文件.7. 利用51單片機(jī)控制步進(jìn)電機(jī)并顯示當(dāng)前轉(zhuǎn)速.8. 5920是PCI橋芯片,節(jié)省了許多用于處理PCI通訊細(xì)節(jié)的開(kāi)發(fā)時(shí)間.這個(gè)是相關(guān)資料.9. XILINX專(zhuān)用術(shù)語(yǔ),中文,很好的規(guī)范教材,可以方便新人能較快的入門(mén).10. 嵌入式的一本好書(shū).11. 該文件中包括89系列 X102開(kāi)發(fā)板的12232液晶屏AD轉(zhuǎn)換器ADC0809,DA轉(zhuǎn)換器DAC0832,I2C總線芯片24C02,RAM電路62256,發(fā)光二極管電路.12. “霓虹燈”小程序.13. 三星公司S3C2410X中文數(shù)據(jù)手冊(cè)完全版.14. 此程序下位機(jī)采集18部0溫度.15. 運(yùn)行環(huán)境:DOS, 通過(guò)串口升級(jí)的下位程序, 需配合上位升級(jí)程序FileUpgrade運(yùn)行, 可用于嵌入式DOS系統(tǒng)中..16. 在電路中選擇運(yùn)算放大器(運(yùn)放)來(lái)實(shí)現(xiàn)某一特定功能時(shí).17. 嵌入式DOS系統(tǒng)上位升級(jí)程序FileUpgrade, 需配合本人上傳的FileUpr程序應(yīng)用, VC++開(kāi)發(fā), 非常實(shí)用, 內(nèi)附說(shuō)明及源碼.18. 步進(jìn)電機(jī)的控制程序.19. moden控制器電路設(shè)計(jì).20. dsPICDEM_v1_1開(kāi)發(fā)板的相關(guān)例程.21. 程序在visual c＋＋環(huán)境下實(shí)現(xiàn)了圖像按照輸入?yún)?shù)進(jìn)行平移旋轉(zhuǎn)和在水平垂直方向上的鏡像功能。.22. Develop Zigbee network real-time Os.23. AT89C51+CPLD 的EPM7064SLC44-10的學(xué)習(xí)板電路圖.24. LSVMK Langrangian Support Vector Machine algorithm LSVMK solves a support vector machine problem us.25. 網(wǎng)上尋找的.26. 介紹了關(guān)于怎樣用DRAM 芯片用做 攝象機(jī).27. s3c2410的背光源碼.28. s3c2410的觸摸屏源碼.29. 嵌入式系統(tǒng)軟件結(jié)構(gòu)設(shè)計(jì) 基于uc/os- 2的軟件設(shè)計(jì).30. 嵌入式實(shí)時(shí)操作系統(tǒng)分析 uc/os-2操作系統(tǒng)內(nèi)核的分析.31. 24C02的讀與寫(xiě).32. 學(xué)習(xí)開(kāi)源gui庫(kù)wxwidgets的入門(mén)源碼.33. 2812的ad的詳細(xì)說(shuō)明.34. LED顯示屏設(shè)計(jì)LED顯 示屏設(shè)計(jì) LED顯示屏設(shè)計(jì) LED顯示屏設(shè)計(jì) LED顯示屏設(shè)計(jì).35. mc68hc08 tim 試驗(yàn)程序?qū)嵗?36. 附帶圖形界面的2410Flash燒寫(xiě)程序.37. OrCAD格式的2410開(kāi)發(fā)板 底板原理圖.38. OrCAD格式的S3C2410X核心板原理圖.39. H_323協(xié)議詳解（中文） 打開(kāi)文件的密碼是:21315038.40. stc單片機(jī)讀內(nèi)部eeprom代碼.
標(biāo)簽： 激光測(cè)量
上傳時(shí)間： 2013-04-15
上傳用戶(hù)：eeworm
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