Abstract: Mechanical misalignment and scaling factors lead to a mismatch between the values coming from a touchscreen panel (as translated by a touch screen controller) and the display (typically an LCD) on which the touch screenpanel is mounted. This tutorial discusses how to calibrate the touch screen panel to match the display.
標(biāo)簽： 校準(zhǔn) 觸摸屏 系統(tǒng)研究
上傳時(shí)間： 2013-10-21
上傳用戶：euroford
Abstract: A perfect voltage reference produces a stable voltage independent of any external factors. Real-world voltagereferences, of course, are subject to errors caused by many external factors. One causeof these major errors istemperature. Without care, it is easy to operate a voltage reference outside its operating temperature range. Thisapplication note describes how references respond to temperature changes, and how self-heating can cause a voltagereference to operate outside its recommended temperature range. Once understood, this knowledge can then be used toavoid making this design error.
標(biāo)簽： 基準(zhǔn)電壓 溫度漂移 應(yīng)用筆記
上傳時(shí)間： 2013-11-08
上傳用戶：xianglee
Abstract: Specifications such as noise, effective number of bits (ENOB), effective resolution, and noise-free resolution inlarge part define how accurate an ADC really is. Consequently, understanding the performance metrics related to noise isone of the most difficult aspects of transitioning from a SAR to a delta-sigma ADC. With the current demand for higherresolution, designers must develop a better understanding of ADC noise, ENOB, effective resolution, and signal-to-noiseratio (SNR). This application note helps that understanding.
標(biāo)簽： ENOB 模數(shù)轉(zhuǎn)換器
上傳時(shí)間： 2013-10-16
上傳用戶：x18010875091
Abstract: The MAX9930–MAX9933 family of RF controllers and detector can be used in a wide variety of applications. Anideal application is cable television (CATV) over fiber, where either a RF controller or a RF detector controls the gain of atransimpedance amplifier (TIA). This application note shows how the MAX9930 (RF controller) can be used as either theRF controller or detector.
上傳時(shí)間： 2013-10-11
上傳用戶：Pzj
所有MEMS麥克風(fēng)都具有全向拾音響應(yīng)，也就是能夠均等地響應(yīng)來(lái)自四面八方的聲音。多個(gè)麥克風(fēng)可以配置成陣列，形成定向響應(yīng)或波束場(chǎng)型。經(jīng)過(guò)設(shè)計(jì)，波束成形麥克風(fēng)陣列可以對(duì)來(lái)自一個(gè)或多個(gè)特定方向的聲音更敏感。麥克風(fēng)波束成形是一個(gè)豐富而復(fù)雜的課題。本應(yīng)用筆記僅討論基本概念和陣列配置，包括寬邊求和陣列和差分端射陣列，內(nèi)容涵蓋設(shè)計(jì)考慮、空間和頻率響應(yīng)以及差分陣列配置的優(yōu)缺點(diǎn)。
標(biāo)簽： 麥克風(fēng)陣列 波束成形
上傳時(shí)間： 2013-10-17
上傳用戶：chenlong
Abstract: This application note presents an overview of the operational characteristics of accurate I²C real-time clocks (RTCs),including the DS3231, DS3231M, and DS3232. It focuses on general application guidelines that facilitate use of device resources forpower management, I²C communication circuit configurations, and I²C characteristics relative to device power-up sequences andinitializations. Additional discussions on decoupling are provided to support developing strategies for mitigating power-supply pushingof device frequency.
標(biāo)簽： I2C 高精度 實(shí)時(shí)時(shí)鐘
上傳時(shí)間： 2013-11-23
上傳用戶：WMC_geophy
數(shù)字水印作為一種防護(hù)技術(shù)，在數(shù)字產(chǎn)品的保護(hù)認(rèn)證方面越發(fā)顯得重要，成為當(dāng)前計(jì)算機(jī)領(lǐng)域研究的熱點(diǎn)問(wèn)題之一。提出了一種在空域采用分塊重復(fù)嵌入水印信息和HVS相結(jié)合的水印技術(shù)。實(shí)驗(yàn)結(jié)果說(shuō)明，分塊技術(shù)在空域的使用提高了水印的嵌入強(qiáng)度和降低計(jì)算復(fù)雜度，該算法在抵抗旋轉(zhuǎn)、裁剪、縮放方面等有較強(qiáng)能力；水印算法與HVS技術(shù)的有效性相結(jié)合，數(shù)字水印具有很好的掩蔽性。
標(biāo)簽： HVS 分塊 數(shù)字水印技術(shù)
上傳時(shí)間： 2013-10-23
上傳用戶：qwerasdf
為了提高語(yǔ)音信號(hào)的識(shí)別率，提出了一種改進(jìn)的LPCC參數(shù)提取方法。該方法先對(duì)語(yǔ)音信號(hào)進(jìn)行預(yù)加重、分幀加窗處理，然后進(jìn)行小波分解，在此基礎(chǔ)上提取LPCC參數(shù)，從而構(gòu)成新向量作為每幀信號(hào)的特征參數(shù)。最后采用高斯混合模型（GMM）進(jìn)行說(shuō)話人語(yǔ)音識(shí)別，實(shí)驗(yàn)表明新特征參數(shù)取得了較好的識(shí)別率。
上傳時(shí)間： 2013-10-10
上傳用戶：asdgfsdfht
模糊綜合評(píng)判法是一種基于模糊數(shù)學(xué)的綜合評(píng)判方法，該綜合評(píng)判法根據(jù)模糊數(shù)學(xué)的隸屬度理論把定性評(píng)判轉(zhuǎn)化為定量評(píng)判，即用模糊數(shù)學(xué)對(duì)受到多種因素制約的事物或?qū)ο笞龀鲆粋€(gè)總體的評(píng)判。它具有結(jié)果清晰，系統(tǒng)性強(qiáng)的特點(diǎn)，能較好地解決模糊的、難以量化的問(wèn)題，適合各種非確定性問(wèn)題的解決。本文以新一代天氣雷達(dá)發(fā)射機(jī)故障為例，論述了該方法如何獲取故障診斷數(shù)據(jù)，如何進(jìn)行故障定位等過(guò)程。
標(biāo)簽： 模糊綜合 故障樹(shù)分析法 中的應(yīng)用
上傳時(shí)間： 2013-10-17
上傳用戶：yxgi5
介紹了MSK信號(hào)的優(yōu)點(diǎn)，并分析了其實(shí)現(xiàn)原理，提出一種MSK高性能數(shù)字調(diào)制器的FPGA實(shí)現(xiàn)方案；采用自頂向下的設(shè)計(jì)思想，將系統(tǒng)分成串/并變換器、差分編碼器、數(shù)控振蕩器、移相器、乘法電路和加法電路等6大模塊，重點(diǎn)論述了串/并變換、差分編碼、數(shù)控振蕩器的實(shí)現(xiàn)，用原理圖輸入、VHDL語(yǔ)言設(shè)計(jì)相結(jié)合的多種設(shè)計(jì)方法，分別實(shí)現(xiàn)了各模塊的具體設(shè)計(jì)，并給出了其在QuartusII環(huán)境下的仿真結(jié)果。結(jié)果表明，基于FPGA的MSK調(diào)制器，設(shè)計(jì)簡(jiǎn)單，便于修改和調(diào)試，性能穩(wěn)定。
標(biāo)簽： FPGA MSK 制器設(shè)計(jì)
上傳時(shí)間： 2013-11-23
上傳用戶：dvfeng
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