if signal 中文意思是什麼

if signal 解釋
中頻信號
  • if : n 條件，設想。 Dash these ifs 讓這一大堆「如果」見鬼去吧 There is no if in the case 這里沒有假定...
  • signal : n 1 信號，暗號；信號器。2 動機，導火線 （for）。3 預兆，徵象。adj 1 暗號的，作信號用的。2 顯著的...
  1. He pressed the red alarm signal to see if it was on or off.

    他按了一下紅色報警信號鈕，檢查一下它是開著的還是關著的。
  2. If you have the money to upgrade your air even further, get a signal transmitter and begin to build planetary assault carriers

    如果你不愁錢，可以建造信號產生器來出行星突擊航母。
  3. The beacon will have a limited beamwidth and if the body-to-beam angle exceeds this a serious loss of signal will result.

    這個信標器的波束寬度有限，如果彈體波束角超過了它，信號就會發生嚴重的衰減。
  4. Lfmcw radar adopts the receiver with the structure of “ homodyne - fourier ”, and acquires the range spectrum after its if signal is sampled, and then processed by ftt

    Lfmcw雷達採用了「差拍-傅立葉」接收機結構，其回波中頻信號經數字採集后進行fft處理，從而獲得雷達的距離譜。
  5. The digital if signal is converted to zero if by digital down converter, then taken fft spectrum analysis with hann window in advance

    數字中頻信號首先通過數字混頻下變頻至零中頻，然後作加海窗的復fft譜分析。
  6. Realization of quadrature coherent detection by direct sampling of if signal

    直接中頻采樣實現正交相干檢波的研究
  7. Radar if signal sampling and engineering implementation of digital coherent detection

    雷達中頻信號采樣及數字相干檢波的工程實現
  8. Presents the development of modern signal processing techniques, a new implementation method which realizes quadrature coherent detection by direct sampling of if signal generated during the implementation of traditional quadrature coherent detection with analog elements in the form of two parallel baseband channels where in phase ( i ) and quadrature ( q ) components of ceived if singnal where, the imperfect matching of the separate channels due to the analog elements results in high phase and amplitude which meets the needs for high performance radar signal processing, the elementary principles and the implementation process for each method and concludes from simulation results to compare their features and application conditions that the new approach can satisfy of the requirements of high performance sp

    針對近年來提出的通過直接中頻采樣來實現正交相干檢波的方法，分析了其基本實現原理，並用統一的觀點解釋了迄今為止國內外基於此提出的各種實現方法；對每一實現方法的基本原理和實現過程都作了分析，並給出了計算機模擬結果；在此基礎上比較了各方法的性能指標及適應條件.理論分析和模擬結果證明，這一方法完全可以滿足高性能信號處理的要求
  9. Analyze, design and simulate the digital down - convert frequency. first, the analogue if signal is converted to digital if signal in one a / d convertor which used passband sampling theory. the digital if signal is then passed to a pair of digital mixers operating in phase quadrature for mixing the if signal to baseband signal

    首先利用帶通采樣定理對中頻模擬信號進行a / d變換后將其混頻到基帶，然後用平方根升餘弦滾降濾波器同時完成低通濾波和匹配濾波雙重作用，以提高解調器的效率。
  10. The theory of digital receiver working with software radio is fully developed, however, limited by the current technical level, it is difficult to realize rf signal digitalization. thus, the prevalent choice is if signal digitalization

    基於軟體無線電思想的數字化接收機理論已經相當成熟，但由於受到硬體器件發展的約束，直接對射頻信號采樣處理面臨著很大困難，因此目前通常採用中頻數字化接收方案。
  11. If signal not pre - distorted, the variable capacity cv1 enables to correct the inclination of the transmitted pass band

    以未預失真條件信號、這個同樣的標準，可變電容cv1賦予權利去校正已傳輸通道波段的傾斜度。
  12. Simulation indicates : using band - pass sampling is right in digitalizing if signal ; it is necessary to use special chip to process if digital signal ; at the same time, it is feasible to process base - band low speed signal ( am, fm etc. ) by software

    模擬表明：中頻數字化技術，使用帶通采樣方案是恰當的；現階段對中頻采樣信號使用專用晶元作降速率處理是必然選擇；同時，對基帶低速率信號（如am 、 fm 、 bpsk信號）作全數字化軟體處理是切實可行的。
  13. By the tuner, the dvb - t signal received has been converted to the if signal, and then demodulated by the cofdm demodulation chip. in the end, the usb controller sends the ts ( transport stream ) to the pc where it is decoded by the software

    接收到的dvb - t信號經調諧器進行下變頻處理后輸出中頻信號，再進行cofdm （編碼正交頻分復用）解調，得到的ts碼流信號通過usb控制器送入pc機中進行軟體解碼播放。
  14. If signal averaging technology was used in our co2 dial system, then would improved the sensitivity of measurement clearly and could meet the demand of development

    運用信號平均技術之後，本課題研製的系統其測量靈敏度完全可以滿足設計要求。
  15. A novel dgs lowpass filter is used to purify if signal

    中頻引出通過新穎的dgs低通濾波器濾波后輸出。
  16. Extraction of the in - pulse characteristics of signal based on direct sampling from if signal and quadrature coherent detection

    基於中頻直接采樣正交相干檢波技術的信號脈內特徵提取
  17. The up converter receives at its input the if signal coming from the modulator and converts it on the rf transmission channel

    上轉換器在它的來自調節器的輸入if信號上接收和在射頻傳輸頻道上轉換。
  18. In the design of w band balanced mixer, if signal is extracted via the fifth port made on the conventional ratrace, and it is sent out through a novel lowpass filter using microstrip stepped - impedance hairpin resonators

    在w頻段單平衡混頻器的研究中，本文在傳統混合環的基礎上引出第五個埠，它連接低通濾波器將中頻輸出。
  19. The system can scan the wideband frequency 、 lock the frequency of receiving data and convert the if signal to digital data timely. directly sampled data by a / d or saved data by sdram ( when signal speed is too high ) can be transmitted to pc by usb2. 0 or to dsp by link port in order to complete the modulation detecting and intercepting of signals

    信號經高速a / d變換可以實時或經sdram緩沖后（當采樣速率過高時）由usb2 . 0總線傳入pc或由linkport傳入後端雙dsp綜合信號處理板進行調制識別處理（或接收由雙dsp信號處理完的數據並傳入pc機完成後續運算處理） ，完成無線電監測。
  20. Pre - equalizer is an option in the design of modulator, but it is always used in order to improve the quality of the if - signal

    內插在調制器中的應用為方案良好的適應性提供了保證。第五章給出了變帶寬預均衡的實現方案。
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