zero cross造句
例句與造句
- Scr zero crossing triggering pulse output
Scr可控硅過零觸發(fā)脈沖輸出 - Scr zero crossing - trigger pulse output
Scr可控硅過零觸發(fā)脈沖輸出 - A novel method of zero cross for 3d biomedical image edge detection
一種基于邊緣檢測(cè)的跳頻檢測(cè)算法研究 - This paper uses " virtual neutral point method " to measure the " zero crossing " , then the soft deal " zero crossing " to get the six key position to commutate
本文采用虛擬中點(diǎn)的方法來識(shí)別反電勢(shì)過零點(diǎn)，然后對(duì)過零點(diǎn)進(jìn)行處理得到無刷電機(jī)換向的六個(gè)關(guān)鍵位置。 - Bar code recognition is a matter of edge detection , which has long been done through the maximum value of the first derivative or zero crossing of the second derivative
條碼識(shí)別是一個(gè)邊緣檢測(cè)問題。長(zhǎng)期以來，邊緣檢測(cè)都是通過一階導(dǎo)數(shù)極大值或二階導(dǎo)數(shù)零交叉進(jìn)行的。 - It's difficult to find zero cross in a sentence. 用zero cross造句挺難的
- Abstract : the performances and characteristiss of the zero crossing digital demodulation is ana lysed through the comparison of various ways of fsk signal digital demodulation . and ideal conclusion is reached
文摘:對(duì)各種頻移鍵控信號(hào)的數(shù)字解調(diào)方法進(jìn)行了研究和比較，并重點(diǎn)分析了零交點(diǎn)數(shù)字解調(diào)法的性能特征，最后得出了一個(gè)最佳結(jié)論 - Then one of the methods of rotor position detection - bemf zero crossing point detection is explained in detail . in succession , the chapter dissertates the method of measuring phase voltage and supply voltage , and analyses the error of rotor position using this method
對(duì)轉(zhuǎn)子位置檢測(cè)方法中的反電勢(shì)過零點(diǎn)法作了比較詳細(xì)的介紹，討論了反電勢(shì)法中相電壓和端電壓的檢測(cè)方法，并分析了利用該方法時(shí)而產(chǎn)生的轉(zhuǎn)子位置檢測(cè)誤差。 - The system uses the microchip pic16f877 made by microchip co . ltd as a control chip . it fulfills the capture of " zero crossing " point and the multifarious protective functions . it realize the approximately exact commutation of the motor and unmanned supervision of the system
本系統(tǒng)是以microchip公司生產(chǎn)的pic16f877為核心芯片，軟硬件結(jié)合完成對(duì)反電勢(shì)過零點(diǎn)的捕捉和系統(tǒng)的各種保護(hù)，實(shí)現(xiàn)了電機(jī)較為準(zhǔn)確的換向和無人監(jiān)控安全運(yùn)行。 - 4 . the hardware of electronic control system is developed . it includes display module whose tasks are man - machine interaction , displaying humidity and temperature , setting humidity , time , date and week , communicating with computer ; power device module which provides power of all modules and drives control equipments to accomplish intention of main control module and can provide zero crossing protection circuit , excess voltage and under voltage protection circuit and excess current protection circuit ; water sensor group , the responsibilities of which are testing the states of water and send the states to scm , then the scm control the water level after judging the states
開發(fā)并實(shí)現(xiàn)了電控系統(tǒng)的硬件部分，包括顯示模塊：主要負(fù)責(zé)人機(jī)交互，顯示濕度、溫度，修改濕度、時(shí)間、日期、星期，和主控模塊通訊；電源驅(qū)動(dòng)模塊：主要提供各個(gè)模塊的電源，驅(qū)動(dòng)被控設(shè)備，實(shí)現(xiàn)主控模塊的意圖，并能實(shí)現(xiàn)繼電器的過零保護(hù)，過流、過壓、欠壓保護(hù)；水位傳感器組：負(fù)責(zé)測(cè)知水位的狀態(tài)，并把此狀態(tài)送入單片機(jī)，單片機(jī)經(jīng)過判斷、處理反過來控制水位，實(shí)現(xiàn)水位的閉環(huán)控制。 - The initial vsd process uses two main characters , the average instantaneous energy and the average instantaneous zero crossing rate ( zcr ) . to make the first recognition for the start and the end , the emphasis of which is to select the appropriate value of the threshold and the length of frame . in the final vsd process , the author compares several characters and confirms the new recognition character
初步分段過程使用了能量和過零率這兩個(gè)主要特征進(jìn)行端點(diǎn)檢測(cè)，重點(diǎn)是合理選擇兩個(gè)重要參數(shù)? ?門限和統(tǒng)計(jì)幀長(zhǎng)度的取值；在最終分段過程中，筆者首先通過比較幾種特征的識(shí)別效果，選擇卡爾曼濾波參數(shù)作為再次分段的識(shí)別特征，還提出了一種新的識(shí)別特征? ?周期性緩變特征，使用這兩個(gè)特征分別在子語音段內(nèi)進(jìn)行端點(diǎn)檢測(cè)。 - In this chapter , the method of bldcm rotor position detection is first discussed . then the principle and algorithm of bemf zero crossing point detection is explained . in succession , the chapter dissertates the software realization of the bemf zero crossing point detection algorithm , the software disturbance filter and the modification of phase displacement , and the software realization of commutation point
在這一章中，先簡(jiǎn)述了無刷直流電機(jī)的轉(zhuǎn)子位置器檢測(cè)方法；然后論述了反電動(dòng)勢(shì)過零檢測(cè)原理和算法以及該算法的軟件實(shí)現(xiàn)、軟件濾波和相移修正、換相點(diǎn)的軟件實(shí)現(xiàn)；最后對(duì)軟件開環(huán)換相起動(dòng)策略作了詳細(xì)論述。 - High - frequency link power converters are receiving increasing attention . when the input frequency of ac - ac converter is quite high , such as 20khz or above , in order to make sure the converter switching action is restricted to the zero crossing point of the link voltage , the switching cycle becomes discrete pulse spectrums , however , the conventional pwm converters are ruled out because they would fail either to the efficiency or the low - distortion criteria
當(dāng)交-交變頻器的輸入頻率非常高，通常為20khz時(shí)，為了在零電壓條件下實(shí)現(xiàn)逆變器開關(guān)管的通斷，變換器的開關(guān)時(shí)刻必須選擇在高頻交流電壓脈沖為零時(shí)，這意味著變換器開關(guān)時(shí)刻在時(shí)間軸上成為不連續(xù)的點(diǎn)，而常規(guī)的硬開關(guān)pwm變換器是將開關(guān)時(shí)刻選擇在任意時(shí)刻。 - The chip jk3ce that is one of micro - controllers in motorola 68hc08 family is used as control unit in this system . the zero crossing point of the back emf can be obtained by comparing the terminal voltage with the virtual neutral point , then using the software of the system can figure out the commutation period . the electronic commutation replaces the mechanical commutation in this way
本系統(tǒng)采用的控制芯片為motorola系列單片機(jī)中的jk3ce ，反電勢(shì)過零點(diǎn)可以通過比較電機(jī)端電壓和虛擬中點(diǎn)電壓來得到，將過零點(diǎn)信號(hào)送往單片機(jī)捕捉端口后由系統(tǒng)軟件來確定換相時(shí)刻，這樣就可以由電子換向裝置替代機(jī)械換相裝置，有利于提高系統(tǒng)運(yùn)行的可靠性，并降低了系統(tǒng)維護(hù)的費(fèi)用。 - Above all , this paper work on the principle of simulink . principle of block and model are explained during initialization and execution stage . then runge - kutta ( 4 , 5 ) formula which is a main numerical integration method of simulink and zero crossing detection function are analyzed
從構(gòu)成模型的基本單元? ?模塊入手，闡述其運(yùn)行機(jī)理并對(duì)模型的執(zhí)行階段進(jìn)行全過程分析，然后介紹simulink的主要數(shù)值積分方法? ?四?五階變步長(zhǎng)runge - kutta法的基本積分原理，以及simulink的拐點(diǎn)處理功能? ?過零點(diǎn)檢測(cè)技術(shù)（ zerocrossingdetection ）的基本原理。