first line switch 中文意思是什麼

first line switch 解釋
第一預選器
  • first : adj 1 最初的，最早的。2 最上等的，第一流的。3 基本的，概要的。4 高音（調）的。n 1 最初，第一；第...
  • line : n 1 線；繩索；釣絲；測深度用繩，捲尺。 a fishing line 釣魚線。 be clever with rod and line 會釣魚...
  • switch : n 1 （樹上折下的）細樹枝；軟鞭子；鞭打。2 假發；（尾巴上的）毛簇。3 〈美國〉【鐵道】道岔扳子，軌...
  1. Invention of out - going secondary line switch, resulting in economy of inter - office trunks. first used at san francisco

    發明外向第二級尋線機，提高了局間中繼的收益，並首次在舊金山使用。
  2. At present, the most of vtr which are used in watch - control occasion for speciality are short of a uniform control - check - alarm system, which brings on the discommodiousness of operation and the user can not know the time of occurring a fault, which reduces the reliability of the watch - control system. therefor, at first, i carefully analyze the servo theory of the vtr which had been produced by chmavc with k mechanism to find out the work rule of the control signal ; second, take out some right control signal ; then for dealing with the problem of vtr in use for watch - control, i choose some right components to design the uniform control system for many special vtr with protel software. it mainly includes the following functions : operation functions of all vtr ( for example : power, play, ff, rew, stop, rec, eject, fwd, rwd, sp, lp ) was controlled by line at the same time ; in, the process of recording, when the tape walks to the end or stops by itself, the system gives an alarm and shows the number of the wrong vtr ; in the process of recording, the system gives an alarm and shows the number of the wrong vtr when the video signal from vidicon is losed ; the system controls all vtr to record on the non - working time when there is something wrong in the guarding section ; the system controls the video from vtr to switch to right monitor

    目前，用在監控場合的業務用錄像機普遍缺乏一個統一的控制及檢測報警系統，這就導致了操作的不方便和出現了故障用戶不知道，降低了監控系統的可靠性，為此，我首先對華錄松下生產的k機芯的錄像機伺服原理進行仔細分析，找出各個伺服控制信號的控制變化規律；然後從中選出合適的控制信號；針對目前錄像機在實際監控使用過程中存在的問題，選用合適的元器件；運用protel繪圖軟體，設計了這個多臺業務用錄像機的統一控制系統，她主要包括以下功能：錄像機操作功能（如power play ff rew stop rec eject及正尋反尋帶速設定等）的統一線控控制功能；磁帶在記錄過程中，磁帶到頭和磁帶自己「偷停」的報警，並要能顯示出具體是哪一臺錄像機；在記錄狀態下，攝像頭輸入信號丟失報警，並要能顯示出具體是哪一臺錄像機；在休息或其他不需要記錄時，一旦警戒區有情況，則控制所有機器自動進入錄像狀態的功能；從錄像機輸出的監控圖像信號對監視器的切換功能。
  3. Earliest use of relays for switch control instead of direct operation of magnets over line wires. first die cast switch frame

    最早使用繼電器。用於開關控制，從而代替了電線中對磁鐵的直接操作。第一個壓鑄件開關架成形。
  4. Conversation by underground cable, 90 miles - new york to philadelphia. invention of keith line switch, resulting in enormous reduction in cost of automatic boards. first used at wilmington, delaware

    通過地下電纜傳輸的電話線路連接紐約和費城，全長90英里。基思尋線機的發明，導致自動交換臺的成本大幅降低，並首次用於特拉華州的威明頓。
分享友人
分享到 Line

分享到臉書