lpf 中文意思是什麼

lpf 解釋
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  1. An lpf can be simulated by setting the bpf ' s centre frequency to zero

    將帶通濾波器的中心頻率設置到0 ,就可以模擬低通濾波器。
  2. Under special conditions a bpf may also be used as an lpf or as an hpf

    在特殊條件下,帶通濾波器也可以用作低通濾波器或高通濾波器。
  3. The design process consisted of computer design by circuit simulation software integrate with electromagnetic simulation software, fabrication of microstrip bpf 、 lpf 、 the match circuits, cavity and test. when rf frequency is 91 ~ 97ghz, lo frequency is 47ghz, power is 10 dbm. the best conversion loss of the 2 and 4 sub - harmonic mixer is 13. 5 db and 23. 5db which is shown in the test

    實測表明,在本振為47ghz ,功率10dbm ,測試射頻帶寬為91ghz 97ghz時,二次與四次分諧波混頻器變頻損耗最優處分別為12 . 7db和23db 。最後對實驗結果進行分析並提出改進措施。
  4. This article according to the acquirement of the system parameters such as : temperature sensitivity 、 angle resolution 、 image forming time etc to design the type and diameter of the antenna ; the receiver type, integral time, rf gain, lpf gain ; the mode of calibration ; the sample frequency and program of the daq ; the scanning time, scan type, etc

    本文根據系統溫度靈敏度、角解析度、成像時間等參數要求,對系統天線類型、直徑,接收機類型、積分時間、射頻增益、視頻放大器增益,定標方式,數據採集卡的采樣頻率、編程及驅動裝置的掃描速度、掃描類型等進行了詳細的分析設計。
  5. The paper designs a more lpf and a numberical filter to eliminate the error, and a frequency tracing tache because system frequency fluctuates ceaselessly. this guarantes synchronization sampling

    為了消除頻率混疊帶來的誤差,專門設計具有較好性能的低通濾波器和數字濾波器;由於系統頻率波動性,設計有硬體電路組成的頻率跟蹤環節,最終實現采樣周期和信號周期同步。
  6. On the basis of physical concept, applying mathematical method, the condition that the problem can be transformed from the voltage - controlled voltage source lpf of two orders to the sinusoidal oscillator is proved and the calculation formula of oscillatory frequency is presented

    摘要以物理概念為基礎,利用數學手段證明?二階壓控電壓源lpf轉化為正弦波振蕩器的條件,同時給出了振蕩頻率的計算式。
  7. We analyzed the anti - jam and band inside anti - interfere performance of the system, and the low probability intercept ( lpi ) of the traditional direct sequence spread spectrum ( dsss ) modulations in the uav platform ' s applications. so a new modulation technique using a multi - level pseudo noise ( pn ) code has been presented. the new multi - level pn code is built from a high speed pn code through a low passed filter ( lpf )

    分析了系統抗阻塞式干擾和抗帶內頻帶干擾的性能,以及常規bpsk qpsk - dsss調制在無人機通信中存在的安全隱患,提出了一種用多電平pn碼進行擴頻調制的方法:採用高速pn碼,經過低通濾波器,產生多電平pn碼進行直序擴頻調制,能在低信噪比情況下有效抵抗平方率檢測器對系統載波的檢測。
  8. The thesis describes a prototype fractional frequency synthesizer which is supported by a project granted by the ministry of science and technology of pr china. firstly, based on the principle of pll, this paper briefly describes three basic pll components : phase detector ( pd ), low pass filter ( lpf ), voltage controlled oscillators ( vco ), analyzes the linearized pll and summaries the transfer functions of third - order pll with ideal intergrator filter respectively. based on a microwave vco, the single point frequency pll frequency ranging from 2. 2 to 2. 5ghz is developed

    首先,從鎖相環的基本理論、原理出發,分析了鎖相環中的三個基本部件:鑒相器、環路濾波器和壓控振蕩器,此後,針對線性化鎖相環進行了分析,研究了在使用比例積分濾波器時,三階鎖相環的環路參數計算;在電路實現時選用了lmx2353 ,在此基礎上,完成了2 . 2 ~ 2 . 5ghz范圍內的小數頻率合成器設計。
  9. In dtc system, the concept of space vector is introduced to analyze and control the ac motor, the electromagnetic torque and flux are caculated and controlled in the stator reference frame, and the optimal pwm gating signas are generated to control the inverter according to the output of the bang - bang regulator. in this paper, the dtc system is designed based on dsp. a speed estimation method is derived detailedly and the sensorless speed close - loop control is conducted. in this system, there are some problems, such as flux drift and torque ripple. to resolve these problem, a modified flux caculation method and some measures such as speed lpf, torque slide filtering are adopted. the system performance is enhanced by these mersures

    直接轉矩控制採用空間矢量的概念來分析異步電機的數學模型和控制其各物理量,直接在定子坐標系中計算和控制轉矩和磁通,藉助于離散的兩點式調節( bang - bang控制)產生pwm信號,直接對逆變器的開關狀態進行優化控制,以獲得轉矩的高動態性能。本文採用dsp設計了直接轉矩控制系統,詳細推導了速度估計方法,進行了無速度傳感器的速度閉環控制。
  10. Lpf low pass filter

    低通濾波器
  11. This is because the bpf is a two - pole filter ; at its cut - off frequency ( when output is 50 per cent ) the output power of a true lpf of the same cut - off would be in fact 70. 7 per cent

    這是因為帶通濾波器是一個兩極濾波器;在其截止頻率下(輸出為50 % ) ,真正的具有相同截止頻率的低通慮波器的輸出功率事實上為70 . 7 % 。
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