以SPCE061A單片機為核心，通過DDS合成技術(shù)設(shè)計制作了一個步進值能任意調(diào)節(jié)的多功能信號源。該信號源在1KHz～10MHz范圍能輸出穩(wěn)定可調(diào)的正弦波，并具有AM、FM、ASK和PSK等調(diào)制功能。信號輸出部分采用低損耗電流反饋型寬帶運放作電壓放大，很好地解決了帶寬和帶負載能力的要求。系統(tǒng)帶中文顯示和鍵盤控制功能，操作簡便，實現(xiàn)效果良好。
上傳時間： 2014-01-17
上傳用戶：趙云興
講述了未來收音機的發(fā)展前景。FM可能將會被DAB取代，AM可能將會被DRM取代。
上傳時間： 2015-12-06
上傳用戶：youth25
This article describes a sniffer for Windows. WinSniff is an application for capturing packets on the network. It displays all the packets that are transmitted on the local network and gives detailed information about each header in the packet. In order to keep it simple, I AM not dealing with application level protocols. If you are interested, you can add features to support various application level protocols such as SMTP, FTP, NETBIOS etc
標簽： application describes capturing for
上傳時間： 2016-01-22
上傳用戶：lijianyu172
*--- --- --- --聲明--- --- --- -----*/ /* VC6.0下運行通過 此程序為本人苦心所做，請您在閱讀的時候，尊重本人的 勞動。可以修改，但當做的每一處矯正或改進時，請將改進 方案，及修改部分發(fā)給本人 (修改部分請注名明：修改字樣) Email: jink2005@sina.com QQ: 272576320 ——初稿完成：06-5-27 jink2005 補充： 程序存在問題： (1) follow集不能處理：U->xVyVz的情況 (2) 因本人偷懶，本程序為加入文法判斷，故 輸入的文法必須為LL(1)文法 (3) 您可以幫忙擴充：消除左遞歸，提取公因子等函數(shù) (4) …… */ /*-----------------------------------------------*/ /*參考書《計算機編譯原理——編譯程序構(gòu)造實踐》 LL(1)語法分析,例1: ERTWF# +*()i# 文法G[E]:(按此格式輸入) 1 E -> TR 2 R -> +TR 3 R -> 4 T -> FW 5 W -> * FW 6 W -> 7 F -> (E) 8 F -> i 分析例句：i*(i)# , i+i# 例2： 編譯書5.6例題1 SHMA# adbe# S->aH H->AMd H->d M->Ab M-> A->AM A->e 分析例句：aaabd# */
上傳時間： 2016-02-08
上傳用戶：ayfeixiao
SDP, Service Delivery Platform, is more for telecom operators who want to manage the Data Service better delivered to the end device users by bridging with back-end content providers. Operators rely on the content provider to create & distribute data content to different types of devices. This is different from the open world in the internet communication. Operators must control who can access what content based on his rate plans. Also, based the content access results, the process will be recorded as the transaction records based on which billing statements can be generated to collected the money and shared by operators and content providers. I AM working on the conceptual architecture level and the real implementation is very complicated due to too many types of service from different content providers to different types of devices based on the different types of the rate plans.
標簽： Service operators Delivery Platform
上傳時間： 2016-03-10
上傳用戶：zycidjl
SDP, Service Delivery Platform, is more for telecom operators who want to manage the Data Service better delivered to the end device users by bridging with back-end content providers. Operators rely on the content provider to create & distribute data content to different types of devices. This is different from the open world in the internet communication. Operators must control who can access what content based on his rate plans. Also, based the content access results, the process will be recorded as the transaction records based on which billing statements can be generated to collected the money and shared by operators and content providers. I AM working on the conceptual architecture level and the real implementation is very complicated due to too many types of service from different content providers to different types of devices based on the different types of the rate plans.
標簽： Service operators Delivery Platform
上傳時間： 2013-12-03
上傳用戶：yph853211
【下載說明】 這里提供給大家的是《Embedded Linux: Hardware, Software, and Interfacing》（嵌入式 Linux---硬件、軟件與接口）一書的英文原版CHM格式下載。 【作者簡介】 Craig Hollabaugh has been fascinated by electronics since he bought an AM radio in elementary school. He was first exposed to Unix during a cross-country talk session in 1985. Later, he administered networked Sun and DEC workstations while pursuing a doctoral degree in electrical engineering at Georgia Institute of Technology. 【內(nèi)容提要】 本書通過一個冬季旅游勝地自動化管理項目實例，從軟件、硬件和接口的觀點介紹嵌入式Linux。引入項目需求后，作者講述了開發(fā)環(huán)境的建立，接著用一系列軟硬件接口實例展示了如何使用異步串行通信、PC并口、USB、內(nèi)存I/O、同步串行通信以及中斷，等等。最后介紹了將前面所有的工作有機地組織在一起的系統(tǒng)集成過程。本書以實際應(yīng)用為導(dǎo)向，書中整個項目的實施過程和軟硬件接口實例都具實踐指導(dǎo)意義。
標簽： Linux Interfacing Embedded Hardware
上傳時間： 2014-01-22
上傳用戶：shus521
fpga的應(yīng)用，一個正弦信號發(fā)生器，可以調(diào)節(jié)頻率大小，和PSK,QSK,FM,AM等調(diào)制
標簽： fpga
上傳時間： 2014-01-11
上傳用戶：zhuyibin
Microsoft .net IL 匯編語言程序設(shè)計指南. To tell the truth, I don t think I had much choice in this matter. Let me explain. With Microsoft .NET technology taking the world by storm, with more and more information professionals getting involved, large numbers of books covering various aspects of this technology have started to arrive—and none too soon. Alas, virtually all of these books are dedicated to .NET-based progrAMming in high-level languages and rapid application development (RAD) environments. No doubt this is extremely important, and I AM sure all these books will have to be reprinted to satisfy the demand. But what about the plumbing?
標簽： Microsoft choice matter truth
上傳時間： 2014-11-06
上傳用戶：二驅(qū)蚊器
I analysis the undermodulation,total modulation and over modulation.And the power distribution ,spectrum.you can understand the basic of AM.
標簽： modulation undermodulation distribution the
上傳時間： 2013-12-17
上傳用戶：sevenbestfei
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