nice document about the fast manipulation of multi-dimensional Arrays in matlab,with some examples to avoid loops and using indices
標(biāo)簽： multi-dimensional manipulation document examples
上傳時(shí)間： 2014-01-23
上傳用戶：edisonfather
This report presents a tutorial of fundamental array processing and beamforming theory relevant to microphone array speech processing. A microphone array consists of multiple microphones placed at different spatial locations. Built upon a knowledge of sound propagation principles, the multiple inputs can be manipulated to enhance or attenuate signals emanating from particular directions. In this way, microphone Arrays provide a means of enhancing a desired signal in the presence of corrupting noise sources. Moreover, this enhancement is based purely on knowledge of the source location, and so microphone array techniques are applicable to a wide variety of noise types. Microphone Arrays have great potential in practical applications of speech processing, due to their ability to provide both noise robustness and hands-free signal acquisition.
標(biāo)簽： Microphone array Tutorial Array Signal Processing
上傳時(shí)間： 2016-06-12
上傳用戶：halias
FPGA(Field Programmable Gate Arrays)是目前廣泛使用的一種可編程器件，F(xiàn)PGA的出現(xiàn)使得ASIC(Application Specific Integrated Circuits)產(chǎn)品的上市周期大大縮短，并且節(jié)省了大量的開發(fā)成本。目前FPGA的功能越來越強(qiáng)大，滿足了目前集成電路發(fā)展的新需求，但是其結(jié)構(gòu)同益復(fù)雜，規(guī)模也越來越大，內(nèi)部資源的種類也R益豐富，但同時(shí)也給測(cè)試帶來了困難，F(xiàn)PGA的發(fā)展對(duì)測(cè)試的要求越來越高，對(duì)FPGA測(cè)試的研究也就顯得異常重要。 本文的主要工作是提出一種開關(guān)盒布線資源的可測(cè)性設(shè)計(jì)，通過在FPGA內(nèi)部加入一條移位寄存器鏈對(duì)開關(guān)盒進(jìn)行配置編程，使得開關(guān)盒布線資源測(cè)試時(shí)間和測(cè)試成本減少了99％以上，而且所增加的芯片面積僅僅在5％左右，增加的邏輯資源對(duì)FPGA芯片的使用不會(huì)造成任何影響，這種方案采用了小規(guī)模電路進(jìn)行了驗(yàn)證，取得了很好的結(jié)果，是一種可行的測(cè)試方案。 本文的另一工作是采用一種FPGA邏輯資源的測(cè)試算法對(duì)自主研發(fā)的FPGA芯片F(xiàn)DP250K的邏輯資源進(jìn)行了嚴(yán)格、充分的測(cè)試，從FPGA最小的邏輯單元LC開始，首先得到一個(gè)LC的測(cè)試配置，再結(jié)合SLICE內(nèi)部?jī)蓚€(gè)LC的連接關(guān)系得到一個(gè)SLICE邏輯單元的4種測(cè)試配置，并且采用陣列化的測(cè)試方案，同時(shí)測(cè)試芯片內(nèi)部所有的邏輯單元，使得FPGA內(nèi)部的邏輯資源得完全充分的測(cè)試，測(cè)試的故障覆蓋率可達(dá)100％，測(cè)試配置由配套編程工具產(chǎn)生，測(cè)試取得了完滿的結(jié)果。
上傳時(shí)間： 2013-06-11
上傳用戶：唐僧他不信佛
如今電力電子電路的控制旨在實(shí)現(xiàn)高頻開關(guān)的計(jì)算機(jī)控制，并向著更高頻率、更低損耗和全數(shù)字化的方向發(fā)展。現(xiàn)場(chǎng)可編程門陣列器件(Field Programmable Gate Arrays)是近年來嶄露頭角的一類新型集成電路，它具有簡(jiǎn)潔、經(jīng)濟(jì)、高速度、低功耗等優(yōu)勢(shì)，又具有全集成化、適用性強(qiáng)，便于開發(fā)和維護(hù)(升級(jí))等顯著優(yōu)點(diǎn)。與單片機(jī)和DSP相比，F(xiàn)PGA的頻率更高、速度更快，這些特點(diǎn)順應(yīng)了電力電子電路的日趨高頻化和復(fù)雜化發(fā)展的需要。因此，在越來越多的領(lǐng)域中FPGA得到了日益廣泛的發(fā)展和應(yīng)用。 本文提出了一種采用現(xiàn)場(chǎng)可編程門陣列(FPGA)器件實(shí)現(xiàn)數(shù)字化變頻調(diào)速控制系統(tǒng)的設(shè)計(jì)方案。該系統(tǒng)能產(chǎn)生三相六路正弦脈寬調(diào)制（SPWM）波形；調(diào)制頻率范圍為0～4KHZ，分7級(jí)控制；16位的速度控制分辨率；載波頻率分8級(jí)控制，最高可達(dá)24KHZ；系統(tǒng)接口兼容Intel系列和Motorola系列單片機(jī)；該系統(tǒng)控制簡(jiǎn)單、精確，易修改，可現(xiàn)場(chǎng)編程；同時(shí)具有脈沖延時(shí)小、最小脈沖刪除、過壓和過流保護(hù)功能等特點(diǎn)，可應(yīng)用于PWM變頻調(diào)速系統(tǒng)的全數(shù)字化控制。文中對(duì)方案的實(shí)現(xiàn)進(jìn)行了詳細(xì)的論述，主要包括系統(tǒng)設(shè)計(jì)的理論分析，系統(tǒng)結(jié)構(gòu)設(shè)計(jì)及在FPGA硬件上的實(shí)現(xiàn)，最終驗(yàn)證了該控制系統(tǒng)的可行性和有效性。 數(shù)字化設(shè)計(jì)是本系統(tǒng)的特點(diǎn)，系統(tǒng)最終生成的三相SPWM脈沖是基于三相正弦調(diào)制波和三角載波比較得到的。設(shè)計(jì)時(shí)，充分結(jié)合FPGA器件的結(jié)構(gòu)特點(diǎn)，利用一種改進(jìn)結(jié)構(gòu)的數(shù)字控制振蕩器（NCO）來產(chǎn)生正弦波樣本，在一定程度上解決了傳統(tǒng)NCO產(chǎn)生正弦波的精度和頻率相互制約的問題；把分時(shí)復(fù)用數(shù)字通信原理結(jié)合到系統(tǒng)的設(shè)計(jì)中，設(shè)計(jì)出分時(shí)運(yùn)算電路，使得系統(tǒng)在同步時(shí)鐘下，生成三相正弦調(diào)制波而不影響系統(tǒng)的速度，同三角載波邏輯比較后，最終得到三相SPWM脈沖序列。
標(biāo)簽： FPGA 變頻調(diào)速控制 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2013-07-05
上傳用戶：duoshen1989
FPGA(Field Programmable Gate Arrays)是目前廣泛使用的一種可編程器件，F(xiàn)PGA的出現(xiàn)使得ASIC(Application Specific Integrated Circuits)產(chǎn)品的上市周期大大縮短，并且節(jié)省了大量的開發(fā)成本。目前FPGA的功能越來越強(qiáng)大，滿足了目前集成電路發(fā)展的新需求，但是其結(jié)構(gòu)同益復(fù)雜，規(guī)模也越來越大，內(nèi)部資源的種類也R益豐富，但同時(shí)也給測(cè)試帶來了困難，F(xiàn)PGA的發(fā)展對(duì)測(cè)試的要求越來越高，對(duì)FPGA測(cè)試的研究也就顯得異常重要。 本文的主要工作是提出一種開關(guān)盒布線資源的可測(cè)性設(shè)計(jì)，通過在FPGA內(nèi)部加入一條移位寄存器鏈對(duì)開關(guān)盒進(jìn)行配置編程，使得開關(guān)盒布線資源測(cè)試時(shí)間和測(cè)試成本減少了99％以上，而且所增加的芯片面積僅僅在5％左右，增加的邏輯資源對(duì)FPGA芯片的使用不會(huì)造成任何影響，這種方案采用了小規(guī)模電路進(jìn)行了驗(yàn)證，取得了很好的結(jié)果，是一種可行的測(cè)試方案。 本文的另一工作是采用一種FPGA邏輯資源的測(cè)試算法對(duì)自主研發(fā)的FPGA芯片F(xiàn)DP250K的邏輯資源進(jìn)行了嚴(yán)格、充分的測(cè)試，從FPGA最小的邏輯單元LC開始，首先得到一個(gè)LC的測(cè)試配置，再結(jié)合SLICE內(nèi)部?jī)蓚€(gè)LC的連接關(guān)系得到一個(gè)SLICE邏輯單元的4種測(cè)試配置，并且采用陣列化的測(cè)試方案，同時(shí)測(cè)試芯片內(nèi)部所有的邏輯單元，使得FPGA內(nèi)部的邏輯資源得完全充分的測(cè)試，測(cè)試的故障覆蓋率可達(dá)100％，測(cè)試配置由配套編程工具產(chǎn)生，測(cè)試取得了完滿的結(jié)果。
上傳時(shí)間： 2013-06-29
上傳用戶：Thuan
Abstract: Many digital devices incorporate analog circuits. For instance, microprocessors, applicationspecificintegrated circuits (ASICs), and field-programmable gate Arrays (FPGAs) may have internalvoltage references, analog-to-digital converters (ADCs) or digital-to-analog converters (DACs). However,there are challenges when you integrate more analog onto a digital design. As with all things in life, inelectronics we must always trade one parameter for another, with the application dictating the propertrade-off of analog function. In this application note, we examine how the demand for economy of spaceand cost pushes analog circuits onto digital substrates, and what design challenges emerge.
標(biāo)簽： 模擬IC 性能 模擬 數(shù)字化設(shè)計(jì)
上傳時(shí)間： 2013-11-17
上傳用戶：菁菁聆聽
Abstract: We can apply a BiCMOS integrated circuit with only resistors and no transistors to solve adifficult design problem. The mythically perfect operational amplifier's gain and temperature coefficient aredependent on external resistor values. Maxim precision resistor Arrays are manufactured together on asingle die and then automatically trimmed, to ensure close ratio matching. This guarantees that theoperational amplifier (op amp) gain and temperature coefficient are predictable and reliable, even withlarge production volumes.
上傳時(shí)間： 2014-11-30
上傳用戶：ynzfm
Abstract: Field-programmable gate Arrays (FPGAs) are used in a wide variety of applications and end markets, including digital signalprocessing, medical imaging, and high-performance computing. This application note outlines the issues related to powering FPGAs.It also discusses Maxim's solutions for powering Altera® FPGAs.
上傳時(shí)間： 2013-11-02
上傳用戶：zhaoman32
The μPSD32xx family, from ST, consists of Flash programmable system devices with a 8032 MicrocontrollerCore. Of these, the μPSD3234A and μPSD3254A are notable for having a complete implementationof the USB hardware directly on the chip, complying with the Universal Serial Bus Specification, Revision1.1.This application note describes a demonstration program that has been written for the DK3200 hardwaredemonstration kit (incorporating a μPSD3234A device). It gives the user an idea of how simple it is to workwith the device, using the HID class as a ready-made device driver for the USB connection.IN-APPLICATION-PROGRAMMING (IAP) AND IN-SYSTEM-PROGRAMMING (ISP)Since the μPSD contains two independent Flash memory Arrays, the Micro Controller Unit (MCU) can executecode from one memory while erasing and programming the other. Product firmware updates in thefield can be reliably performed over any communication channel (such as CAN, Ethernet, UART, J1850)using this unique architecture. For In-Application-Programming (IAP), all code is updated through theMCU. The main advantage for the user is that the firmware can be updated remotely. The target applicationruns and takes care on its own program code and data memory.IAP is not the only method to program the firmware in μPSD devices. They can also be programmed usingIn-System-Programming (ISP). A IEEE1149.1-compliant JTAG interface is included on the μPSD. Withthis, the entire device can be rapidly programmed while soldered to the circuit board (Main Flash memory,Secondary Boot Flash memory, the PLD, and all configuration areas). This requires no MCU participation.The MCU is completely bypassed. So, the μPSD can be programmed or reprogrammed any time, anywhere, even when completely uncommitted.Both methods take place with the device in its normal hardware environment, soldered to a printed circuitboard. The IAP method cannot be used without previous use of ISP, because IAP utilizes a small amountof resident code to receive the service commands, and to perform the desired operations.
標(biāo)簽： Demonstration 3200 USB for
上傳時(shí)間： 2014-02-27
上傳用戶：zhangzhenyu
Abstract: Designers who must interface 1-Wire temperature sensors with Xilinx field-programmable gate Arrays(FPGAs) can use this reference design to drive a DS28EA00 1-Wire slave device. The downloadable softwarementioned in this document can also be used as a starting point to connect other 1-Wire slave devices. The systemimplements a 1-Wire master connected to a UART and outputs temperature to a PC from the DS28EA00 temperaturesensor. In addition, high/low alarm outputs are displayed from the DS28EA00 PIO pins using LEDs.
標(biāo)簽： PicoBlaze Create Master Xilinx
上傳時(shí)間： 2013-11-05
上傳用戶：a6697238
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