time coder 中文意思是什麼

Real time implementation of g. 723. 1 speech coder based on tm

1語音編解碼器的實時實現

( c ) propose the scheme to implementing the coder and deoder of optical time - spreading / frequency - hopping, by assigning two orthogonal codes for one user and using these two codes to encoding 1 and 0 respectively, differential detection can be adopted. not only improves system performances in ber, but also resists the interference such as mai, and does n ' t need any control devices to evaluate the optimum decisive threshold

通過給每個用戶指定互相關為0的兩個地址碼分別發送1和0信號以及在接收端採用差分檢測技術，避免了ook （開關鍵控）光通信系統中0不發送光脈沖和ook常規檢測方式下最佳判決門限必須根椐用戶數等外界環境而改變，從而提高了系統性能和降低了系統的復雜度。

The equijpment is improved in design and is made into a fully automatic h - beam assembling machine referred to the same foreign sort of products. the positioning of the flange and web is performed through hte plus and minus screw mandrel drivenby the mtr accurately. and there is a highly precise coder to feedb - ack and show the accurate size on the unit set to guarantee the flanges, the webs with different width different width within the specified range for accurate positioning and automatic alignmet. there is no need to make adjustment each time

該機是本廠參考國外同類產品基礎上改進設計而成的全自動h型鋼組立設備，其腹板翼板定位採用電機精確帶動正反絲桿夾緊，另一側設有小行程液壓夾緊，能確保規定范圍內的不同寬窄的腹板，翼板精確定位，自動對中準確，無須每次作調準。

According to the request of this subject, we have developed the system hardware and software for the slave device and the inspection software running on the pc. in this paper all of the followings is illustrated detailedly, such as the research on the principles of measurement and its realization, three means of water - level measurement that are separately based on photo electricity coder, pressure sensor and potentiometer ; selection of the microchip, we choose an advanced integrated soc ( system on chip ) microchip c8051f021 as the main controller ; realization of signal sampling, processing and its conversion in the mcu ; application of high precision 16 bits adc cmos chip - - ad7705 in our system, designing its interface with the microchip and relevant program ; using a trickle charge timekeeping chip ds1302 in the system which can provide time norm and designing of its i / o interface and program ; additionally, a 4 ~ 20ma current output channel to provide system check - up using ad421. in the system, ad421, ad7705 and the microchip compose spi bus ; to communicate with the master pc, here we use two ways which are separately rs232 and rs485 ; moreover, there are alarm unit, keyboard unit, power supply inspection unit and voltage norm providing unit in the system

針對研製任務的要求，課題期間研製了下位機系統硬體和軟體，開發了上位機監控軟體，其中所作的具體工作包括：測量原理的研究和在系統中的實現，在本次設計中用三種方法來進行水位測量，分別是旋轉編碼器法、液位壓力傳感器法和可變電阻器法；主控晶元的選擇，我們選用了高集成度的混合信號系統級晶元c8051f021 ；實現了信號的採集和處理，包括信號的轉換和在單片機內的運算；高集成度16位模數轉換晶元ad7705在系統中的應用，我們完成了它與單片機的介面設計及程序編制任務；精確時鐘晶元ds1302在系統中的應用，在此，我們實現了用單片機的i o口與ds1302的連接和在軟體中對時序的模擬，該晶元的應用給整臺儀器提供了時間基準，方便了儀器的使用；另外，針對研製任務的要求，還給系統加上了一路4 20ma模擬信號電流環的輸出電路來提供系統監測，該部分的實現是通過採用ad421晶元來完成的，本設計中完成了ad421與單片機的spi介面任務，協調了它與ad7705晶元和單片機共同構成的spi總線系統的關系，並完成了程序設計；與上位機的通信介面設計，該部分通過兩種方法實現： rs232通信方式和rs485通信方式；系統設計方面還包括報警電路設計、操作鍵盤設計、電源監控電路設計、電壓基準電路的設計。

Exp - golomb codes are applied to code the pairs of the run - length of zero coefficients and the nonzero coefficient for lower storage requirement. c2dvlc is a low complexity coder in terms of both computational time and memory requirement

以往視頻編碼標準如h . 263定義了可選擇的算術編碼器，新近的h . 264 avc標準也採用了高效的算術編碼方法cabac 。

This system uses the evm of dual - core tms320vc5471. for the different core configuration, the dsp has a / d and d / a modules to implement speech signal i / o channel, real time implementation of speech coder. meanwhile embedded operation system uclinux is transplanted into it

結合cpu兩個內核不同的體系結構，在dsp內核上連接a / d 、 d / a模塊實現語音信號i / o通道以及實時實現語音編解碼演算法，在arm內核上移植了clinux嵌入式操作系統。