例句與造句

1. Research on frequency - shift sending equipment with microcomputer
   移頻發(fā)送設(shè)備的電子化方案研究
2. Afsk for audio frequency - shift keying
   音頻頻移鍵控
3. Study on the model of transmitting cable crosstalk in frequency - shift track circuit
   移頻軌道電路傳輸電纜串音模型的研究
4. Fsk for frequency - shift keying
   頻移鍵控
5. The practice of doppler frequency - shift signal extraction in ultrasonic blood flow detector
   多普勒頻移信號提取技術(shù)在超聲血流檢測中應(yīng)用
6. It's difficult to find frequency-shift in a sentence. 用frequency-shift造句挺難的
7. The optical sampling with frequency - shift , asynchronous optical sampling , and photonic analog to digital conversion based on time - interleave were investigated , included the theoretical analysis and experimental demonstration
   建立了頻差法光脈沖取樣、異步光取樣及基于時分光取樣的光子模數(shù)轉(zhuǎn)換實驗裝置。
8. Because frequency - shift signal is a kind of modulation signal , it ' s waveform is two ac sine signal of alternating i . e . upper frequency and lower frequency which was generated by low frequency modulating middle frequency
   由于移頻信號是一種調(diào)頻信號，其波形為低頻信號調(diào)制中心載頻信號后產(chǎn)生的低端載頻（下邊頻）和高端載頻（上邊頻）兩個交替變化的正弦交流信號。
9. The ministry of railway has developed two kinds of frequency - shift track circuits based on the primary 4 - information frequency - shift system : 18 - information frequency - shift auto - blocking track circuit made in china and um - 71 jointless track circuit made in france , and put them into use on some important lines . but at the mean while , the safety of running train becomes austerer and austerer
   鐵道部根據(jù)我國國情,在原有4信息移頻制式的基礎(chǔ)上,研制開發(fā)了兩種移頻軌道電路:國產(chǎn)18信息移頻自動閉塞系統(tǒng)和法國um - 71無絕緣軌道電路系統(tǒng),并將其應(yīng)用到我國部分主要線路上。
10. At the last we program the parameter detecting methods for frequency - shift track signal with c language and assembly language base on code composer studio of dsp . then we realize it on the dsp chip of tms320f2812 . experiments shows that it can satisfy the demand of real time and precision
    最后在dsp的集成開發(fā)環(huán)境ccs ( codecomposerstudio )上采用c語言和匯編語言混合編寫移頻軌道信號的參數(shù)檢測算法,并將該算法移植到dsp芯片( tms320f2812 )上實現(xiàn),測試結(jié)果表明上述算法能夠滿足實時性和精度的要求。
11. The actively and passive mode - locked fiber ring laser and two types of photonic switching , slalom ( semiconductor laser amplifier loop mirror ) and uni ( ultrafast nonlinear interferometer ) were developed . this thesis presented the principle and the requirements for the optical of frequency - shift sampling module under common conditions
    研制了作為光取樣脈沖源的主動鎖模和被動鎖模光纖激光器；半導(dǎo)體光放大器環(huán)鏡及超高速非線性干涉儀的光子開關(guān)，并進(jìn)行了頻差法光取樣、異步光取樣及基于時分光取樣的光子模數(shù)轉(zhuǎn)換的實驗研究。
12. On the basis of the former research works , we present the detecting method as follows : for the narrow band characteristic of the track signal we use under - sampling instead of nyquist sampling to reduce the sampling rate . as to the carrier frequency , the spectrum of the 18 - information frequency - shift track signal has two peaks , then the carrier frequency is the average of the two peak frequency , to um - 71 jointless track signal , it has only one peak , then the carrier frequency is the peak frequency
    針對移頻軌道信號的窄帶特性提出了使用欠采樣技術(shù)代替奈奎斯特采樣的方法,以降低信號的采樣頻率;國產(chǎn)18信息移頻軌道信號頻譜具有雙峰,雙峰頻率平均值就是信號的載頻頻率,而um - 71無絕緣軌道信號頻譜單峰,峰值頻率即為信號的載頻頻率。
13. In this paper , bit - error rate performance analyses are presented for coded and un - coded frequency hopping m - ary frequency - shift keyed systems under the condition of additive white gaussian noise ( awgn ) and partial band noise jamming and multitone jamming . the use of error - correct codes provide a way to improve the performance of frequency hopping system , particularly the use of reed - solomon code in a fh system under the condition of partial band noise jamming can greatly improve the performance of system . so we provide the way of coding and decoding of rs code in c language . in the end , we offer the simulation of the performance of time diversity fh / 2fsk system over partial band jamming noise channels
    第一章為緒論，敘述跳頻通信的發(fā)展趨勢，以及基本概念，第二章及第三章介紹提高抗部分頻帶干擾的前向糾錯碼reed - solomon碼的原理和實現(xiàn)方法。第四章研究跳頻通信系統(tǒng)在各種干擾條件下的性能。最后在第五章以fh mfsk系統(tǒng)為例，探討在部分頻帶干擾下的系統(tǒng)性能，并進(jìn)行計算機(jī)仿真，仿真結(jié)果表明采用分集技術(shù)和各種編碼技術(shù)對于系統(tǒng)的性能改善具有明顯的效果。