用matlab仿真實現(xiàn)了25 kHz 帶寬內(nèi)同時傳送總共48 Kbit/s 的兩路語音(每路速率9. 6 Kbit/s) 和兩路數(shù)據(jù)信息(速率分別為19. 2 Kbit/s 和9. 6 Kbit/s) , 仿真結(jié)果表明達到了較好的誤碼性能。并比較了4 種數(shù)字調(diào)制方式下O FDM 系統(tǒng)的誤碼性能。
上傳時間： 2014-01-22
上傳用戶：aeiouetla
ITU規(guī)范G.704。E1幀結(jié)構(gòu)定義。Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 Kbit/s hierarchical levels
標簽： Synchronous structures frame 1544
上傳時間： 2016-03-24
上傳用戶：lnnn30
英文版G.729語音壓縮標準。 GENERAL ASPECTS OF DIGITAL TRANSMISSION SYSTEMS CODING OF SPEECH AT 8 Kbit/s USING CONJUGATE-STRUCTURE ALGEBRAIC-CODE-EXCITED LINEAR-PREDICTION (CS-ACELP)
標簽： TRANSMISSION GENERAL ASPECTS DIGITAL
上傳時間： 2016-09-29
上傳用戶：15071087253
Profibus DP software slave for MSP430F2252. Tested on Siemens S7 with 19200 and 93750 Kbit
標簽： Profibus software Siemens Tested
上傳時間： 2014-09-07
上傳用戶：zsjzc
高速發(fā)展的DSP技術(shù)為語音信號處理領(lǐng)域提供了良好的發(fā)展平臺，使得實時實現(xiàn)各種復雜的算法稱為可能。G．729語音編碼是國際電信聯(lián)盟(ITU-T)于1996年獲準通過的采用共軛結(jié)構(gòu)代數(shù)碼激勵線性預測技術(shù)的具有8 Kbit/s碼速率的語音算法建議，廣泛應用于數(shù)字移動通信、IP電話和數(shù)字衛(wèi)星通信中。本文研究了G．729語音編碼原理和在TMS320C5416定點DSP芯片上實時實現(xiàn)該編碼器過程中的軟、硬件設(shè)計。主要涉及有以下幾方面內(nèi)容： 1．介紹語音編碼技術(shù)和DSP技術(shù)的發(fā)展概況。 2．研究了基于CELP結(jié)構(gòu)的G．729編碼的算法原理。 3．根據(jù)G．729聲碼器實時實現(xiàn)的需要，介紹硬件平臺的組成，研究了系統(tǒng)軟件的設(shè)計和基于算法和實時需要的軟件優(yōu)化。 4．利用DSP代碼調(diào)試工具對系統(tǒng)性能進行分析，得出測試結(jié)果。
上傳時間： 2013-07-11
上傳用戶：woshiayin
The MAX3243E device consists of three line drivers, five line receivers, and a dual charge-pump circuit with±15-kV ESD (HBM and IEC61000-4-2, Air-Gap Discharge) and ±8-kV ESD (IEC61000-4-2, Contact Discharge)protection on serial-port connection pins. The device meets the requirements of TIA/EIA-232-F and provides theelectrical interface between an asynchronous communication controller and the serial-port connector. Thiscombination of drivers and receivers matches that needed for the typical serial port used in an IBM PC/AT, orcompatible. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-Vsupply. In addition, the device includes an always-active noninverting output (ROUT2B), which allowsapplications using the ring indicator to transmit data while the device is powered down. The device operates atdata signaling rates up to 250 Kbit/s and a maximum of 30-V/ms driver output slew rate.
標簽： MULTICHANNEL 5.5 TO RS
上傳時間： 2013-10-19
上傳用戶：ddddddd
The NCV7356 is a physical layer device for a single wire data linkcapable of operating with various Carrier Sense Multiple Accesswith Collision Resolution (CSMA/CR) protocols such as the BoschController Area Network (CAN) version 2.0. This serial data linknetwork is intended for use in applications where high data rate is notrequired and a lower data rate can achieve cost reductions in both thephysical media components and in the microprocessor and/ordedicated logic devices which use the network.The network shall be able to operate in either the normal data ratemode or a high-speed data download mode for assembly line andservice data transfer operations. The high-speed mode is onlyintended to be operational when the bus is attached to an off-boardservice node. This node shall provide temporary bus electrical loadswhich facilitate higher speed operation. Such temporary loads shouldbe removed when not performing download operations.The bit rate for normal communications is typically 33 Kbit/s, forhigh-speed transmissions like described above a typical bit rate of83 Kbit/s is recommended. The NCV7356 features undervoltagelockout, timeout for faulty blocked input signals, output blankingtime in case of bus ringing and a very low sleep mode current.
上傳時間： 2013-10-24
上傳用戶：s藍莓汁
IA4420 工作在315/433/868/915MHz 頻段（IA4421 工作在433/868/915MHz 頻段）； 2． 低電壓工作，工作電壓2.2V~5.4V； 3． 低功耗模式，待機電流0.3uA； 4． 調(diào)制模式FSK，并具備高度集成的PLL； 5． 低發(fā)射功率、高接收靈敏度設(shè)計，發(fā)射功率5~10 dbm 可調(diào)，接收靈敏度-109 dbm； 6． 內(nèi)置時鐘輸出，可省掉MCU 的晶振； 7． 傳輸數(shù)據(jù)率高，數(shù)字信號可達115.2 Kbit/s,模擬信號可達256 Kbit/s； 8． 發(fā)射頻偏與接收帶寬可調(diào)； 9． 內(nèi)部有數(shù)字濾波器，并可以根據(jù)要求選擇不同的方式； 10． SPI 的控制接口，方便使用； 11． 接收時有數(shù)據(jù)同步碼識別器，系統(tǒng)檢測同步碼后將后面的數(shù)據(jù)輸出； 12． 有16 位的收發(fā)緩存器，用來緩存接收到或要發(fā)送的數(shù)據(jù)（接收數(shù)據(jù)有兩種方式，用戶可以按需選擇）； 13． 有低電壓檢測器，從2.2-5.4V 可調(diào)； 14． 有定時喚醒功能，定時時間可達幾天； 15． 天線的兼容性強，有天線自動調(diào)節(jié)功能，并可采用PCB 或外置天線； 16． 工作溫度范圍-40~85，儲存溫度范圍-55~125℃； 17． 采用微小TSSOP16 封裝。
上傳時間： 2014-10-30
上傳用戶：aa17807091
ITU-T G.729語音壓縮算法。 description: Fixed-point description of commendation G.729 with ANNEX B Coding of Speech at 8 Kbit/s using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) with Voice Activity Decision(VAD), Discontinuous Transmission(DTX), and Comfort Noise Generation(CNG).
標簽： description commendation Fixed-point 729
上傳時間： 2014-11-23
上傳用戶：thesk123
AT88SC0104(at88sc,at88sc0104c)燒錄器軟件下載，壓縮包里面附帶使用說明書 AT88SC0104C 1-Kbit 用戶存儲器， 帶身份認證和加密 AT88SC0204C 2-Kbit 用戶存儲器， 帶身份認證和加密 AT88SC0404C 4-Kbit 用戶存儲器， 帶身份認證和加密 AT88SC0808C 8-Kbit 用戶存儲器， 帶身份認證和加密 AT88SC1616C 16-Kbit 用戶存儲器， 帶身份認證和加密 AT88SC3216C 32-Kbit 用戶存儲器， 帶身份認證和加密 AT88SC6416C 64-Kbit 用戶存儲器， 帶身份認證和加密 AT88SC12816C 128-Kbit 用戶存儲器，帶身份認證和加密 AT88SC25616C 256-Kbit 用戶存儲器，帶身份認證和加密
上傳時間： 2016-04-03
上傳用戶：x4587
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