隨著國民經濟的發(fā)展和社會的進步,人們越來越需要便捷的交通工具,從而促進了汽車工業(yè)的發(fā)展,同時汽車發(fā)動機檢測維修等相關行業(yè)也發(fā)展起來。在汽車發(fā)動機檢測維修中,發(fā)動機電腦(Electronic Control.Unit-ECU)檢測維修是其中最關鍵的部分。發(fā)動機電腦根據(jù)發(fā)動機的曲軸或凸輪軸傳感器信號控制發(fā)動機的噴油、點火和排氣。所以,維修發(fā)動機電腦時,必須對其施加正確的信號。目前,許多發(fā)動機的曲軸和凸輪軸傳感器信號已不再是正弦波和方波等傳統(tǒng)信號,而是多種復雜波形信號。為了能夠提供這種信號,本文研究并設計了一種能夠產生復雜波形的低成本任意波形發(fā)生器(arbitrary Waveform Generator-AWG)。 本文提出的任意波形發(fā)生器依據(jù)直接數(shù)字頻率合成(Direct Digial FrequencySynthesis-DDFS)原理,采用自行設計現(xiàn)場可編程門陣列(FPGA)的方案實現(xiàn)頻率合成,擴展數(shù)據(jù)存儲器存儲波形的量化幅值(波形數(shù)據(jù)),在微控制單元(MCU)的控制與協(xié)調下輸出頻率和相位均可調的信號。 任意波形發(fā)生器主要由用戶控制界面、DDFS模塊、放大及濾波、微控制器系統(tǒng)和電源模塊五部分組成。在設計中采用FPGA芯片EPF10K10QC208-4實現(xiàn)DDFS的硬件算法。波形調整及濾波由兩級放大電路來完成:第一級對D/A輸出信號進行調整;第二級完成信號濾波及信號幅值和偏移量的調節(jié)。電源模塊利用三端集成穩(wěn)壓器進行電壓值變換,利用極性轉換芯片ICL7660實現(xiàn)正負極性轉換。 該任意波形發(fā)生器與通用模擬信號源相比具有:輸出頻率誤差小,分辨率高,可產生任意波形,成本低,體積小,使用方便,工作穩(wěn)定等優(yōu)點,十分適合汽車維修行業(yè)使用,具有較好的市場前景。
標簽: FPGA 任意波形發(fā)生器
上傳時間: 2013-05-28
上傳用戶:cylnpy
隨著國民經濟的發(fā)展和社會的進步,人們越來越需要便捷的交通工具,從而促進了汽車工業(yè)的發(fā)展,同時汽車發(fā)動機檢測維修等相關行業(yè)也發(fā)展起來。在汽車發(fā)動機檢測維修中,發(fā)動機電腦(Electronic Control.Unit-ECU)檢測維修是其中最關鍵的部分。發(fā)動機電腦根據(jù)發(fā)動機的曲軸或凸輪軸傳感器信號控制發(fā)動機的噴油、點火和排氣。所以,維修發(fā)動機電腦時,必須對其施加正確的信號。目前,許多發(fā)動機的曲軸和凸輪軸傳感器信號已不再是正弦波和方波等傳統(tǒng)信號,而是多種復雜波形信號。為了能夠提供這種信號,本文研究并設計了一種能夠產生復雜波形的低成本任意波形發(fā)生器(arbitrary Waveform Generator-AWG)。 本文提出的任意波形發(fā)生器依據(jù)直接數(shù)字頻率合成(Direct Digial FrequencySynthesis-DDFS)原理,采用自行設計現(xiàn)場可編程門陣列(FPGA)的方案實現(xiàn)頻率合成,擴展數(shù)據(jù)存儲器存儲波形的量化幅值(波形數(shù)據(jù)),在微控制單元(MCU)的控制與協(xié)調下輸出頻率和相位均可調的信號。 任意波形發(fā)生器主要由用戶控制界面、DDFS模塊、放大及濾波、微控制器系統(tǒng)和電源模塊五部分組成。在設計中采用FPGA芯片EPF10K10QC208-4實現(xiàn)DDFS的硬件算法。波形調整及濾波由兩級放大電路來完成:第一級對D/A輸出信號進行調整;第二級完成信號濾波及信號幅值和偏移量的調節(jié)。電源模塊利用三端集成穩(wěn)壓器進行電壓值變換,利用極性轉換芯片ICL7660實現(xiàn)正負極性轉換。 該任意波形發(fā)生器與通用模擬信號源相比具有:輸出頻率誤差小,分辨率高,可產生任意波形,成本低,體積小,使用方便,工作穩(wěn)定等優(yōu)點,十分適合汽車維修行業(yè)使用,具有較好的市場前景。
標簽: FPGA 任意波形發(fā)生器
上傳時間: 2013-04-24
上傳用戶:KIM66
NTL is a high-performance, portable C++ library providing data structures and algorithms for manipulating signed, arbitrary length integers, and for vectors, matrices, and polynomials over the integers and over finite fields.
標簽: high-performance algorithms structures providing
上傳時間: 2014-01-05
上傳用戶:水中浮云
This program demonstrates some function approximation capabilities of a Radial Basis Function Network. The user supplies a set of training points which represent some "sample" points for some arbitrary curve. Next, the user specifies the number of equally spaced gaussian centers and the variance for the network. Using the training samples, the weights multiplying each of the gaussian basis functions arecalculated using the pseudo-inverse (yielding the minimum least-squares solution). The resulting network is then used to approximate the function between the given "sample" points.
標簽: approximation demonstrates capabilities Function
上傳時間: 2014-01-01
上傳用戶:zjf3110
Many applications use connection/object pool. A program may require a IMAP connection pool and LDAP connection pool. One could easily implement a IMAP connection pool, then take the existing code and implement a LDAP connection pool. The program grows, and now there is a need for a pool of threads. So just take the IMAP connection pool and convert that to a pool of threads (Copy, paste, find, replace????). Need to make some changes to the pool implementation? Not a very easy task, since the code has been duplicated in many places. Re-inventing source code is not an intelligent approach in an object oriented environment which encourages re-usability. It seems to make more sense to implement a pool that can contain any arbitrary type rather than duplicating code. How does one do that? The answer is to use type parameterization, more commonly referred to as templates.
標簽: connection pool applications program
上傳時間: 2013-12-25
上傳用戶:playboys0
It support IPv4 and IPv6 unicast and multicast and contains a trivial sender and a trivial receiver that can be used to send or receive arbitrary data over RTP. An implementation of generic forward error correction is planned, t
標簽: and trivial multicast contains
上傳時間: 2013-12-14
上傳用戶:金宜
華東師范大學(面向對象程序設計基于C++)課程全部作業(yè)(12次)代碼,包含一個大整數(shù)類。(包含作業(yè)內容) 1 How to use VC++ & IBM Visual Age (XL) C++ 2 Pointers, Arrays and Structures 3 Operators & Statements 4 Functions 5 Use of classes in STL 6 Define concrete classes 7 Data abstraction 8 Operator Overloading 9 Define integer type with arbitrary precision 10 Virtual functions 11 Templates 12 Exception handling
上傳時間: 2016-02-24
上傳用戶:baiom
DBSCAN是一個基于密度的聚類算法。改算法將具有足夠高度的區(qū)域劃分為簇,并可以在帶有“噪聲”的空間數(shù)據(jù)庫中發(fā)現(xiàn)任意形狀的聚類。-DBSCAN is a density-based clustering algorithm. Algorithm change will have enough height to the regional cluster. and to be with the "noise" of the spatial database found clusters of arbitrary shape.
上傳時間: 2013-12-28
上傳用戶:q123321
Fast settling-time added to the already conflicting requirements of narrow channel spacing and low phase noise lead to Fractional4 divider techniques for PLL synthesizers. We analyze discrete "beat-note spurious levels from arbitrary modulus divide sequences including those from classic accumulator methods.
標簽: settling-time requirements conflicting already
上傳時間: 2016-04-14
上傳用戶:liansi
FIR濾波器的C++實現(xiàn) Below are program source listings for FIR.h and FIR.cpp, the header file and class file for implementing arbitrary causal FIR filters in the Synthesis Tool Kit (STK) framework
上傳時間: 2013-12-11
上傳用戶:heart520beat