To utilize the advantages of dsp chips, the system should be computing sources economical. according to digital signal processing theory, the poly - phase fir can help reduce the workloads of the ddc / duc. therefore, adding the complex carrier mixers, the channelization system ( a method of using a single wideband facility to transmit many relatively narrow - bandwidth signals. by subdividing the frequency spectrum used in the wideband channel ) can be formed utilizing the characters of fft
為了使開發出的軟體可以適用於高速dsp器件開發,節省系統資源,課題首先從數字信號處理的理論進行分析,得出可以利用
抽樣率轉換的數字濾波器的特點,即多相濾波實現數字上下變頻計算負擔的減小,之後進一步將多相濾波器與頻譜搬移部分結合,通過公式的推導,得出可利用快速傅立
葉變換的特點實現多路信號的通道化發射和接收的處理模型。
Manager of chinavnet ye lisheng addressed at the party that the collaboration of chinavnet and tencent qq will enable the vast number of qq users to enjoy various qq vas including qq coin recharge via chinavnet, qq love, qq show and qq vips more conveniently on chinavnet s platform ; qq, on the other hand, will greatly satisfy the individualized demand of chinavnet users concerning im, online games, friend making and internet communities. at the earlier stage of this acitivity, chinavnet also provided qq service users through chinavnet platform with lottery opportunities on the spot. the prizes of the lottery including valentine s three - day shanghai tour and souvenirs etc. became an eye catcher at the party
晚會上互聯星空總經理
葉利生表示,互聯星空與騰訊qq的攜手,可望讓廣大的qq用戶能夠通過互聯星空的服務平臺,更加便捷的享用豐富多彩的qq增值服務包括互聯星空q幣充值qq交友qq秀qq會員而qq的加盟,也會極大的滿足互聯星空用戶在即時通信游戲交友社區等方面的個性化需求同時,在前期活動期間通過互聯星空使用騰訊qq服務的消費者,互聯星空更是提供了現場的
抽獎機會,包括上海情人節三日游及紀念品在內的各獎項,在晚會中成為了現場觀眾關注的熱點。
Application of endwall boundary layer suction in the stator cascade of steam turbine governing stage
端壁邊界層
抽吸技術在汽輪機調節級靜
葉柵中的應用
In this thesis, summarized the basic theories of fourier transformation and the fast fourier transformation that are generally adopted to detect and analyze the electric power harmonic in the electric power supply system. at the same time, summarized the even sample principle, the phenomenon of frequency mix, the window functions and the frequency leaking as so on, those are closely - related to sample from figure signal
簡要闡述了電力系統諧波檢測分析所普遍採用的傅利
葉變換和快速傅利
葉變換的基本理論以及與數字信號采樣密切相關的均勻
抽樣定理、頻譜混疊現象、窗函數和頻譜泄漏等的基本理論。
Summarized no - line loads and the present situations of the electric power harmonic pollution in the guangyuan district ' s electric power supply system ; explained the theories of fourier transformation and the fast fourier transformation those are widely adopted by majority scholars to examine and analyze the electric power harmonic in the electric power supply system. summarized the principle of even sample, the frequency mix phenomenon, the window functions and the frequency leaking as so on, those are closely - related to the figure signal
簡要闡述了電力系統諧波檢測分析所普遍採用的傅利
葉變換和快速傅利
葉變換的基本理論,簡要闡明了與數字信號采樣密切相關的均勻
抽樣定理、頻譜混疊現象、窗函數和頻譜泄漏等的基本理論,同時闡述了電力系統的諧波檢測與分析的相關理論基礎知識。
The results of the 2 - yrs investigation in 1993 and 1994 show that significant phenological phases occurred in various months, and are listed as follows : budding and leafing phase was from march to april ; flower appearing phase in april ; peak leafing phase from april to may ; flowering phase from april to june ; fruiting phase from july to october ; and leaf falling phase for deciduous trees was from october to the following february
以1993年和1994年兩年間的調查結果顯示,在福山地區明顯的物候現象發生的月份如下: 3月和4月為
抽芽展
葉, 4月為花出現, 4月和5月為展
葉盛期, 4 6月為開花期, 7 10月為著果期, 10月至次年2月為落
葉樹種之落
葉期。
When sparsely - planted rice overgrew its earing period, light intensity in the mid - lower part increased, photosynthesis prolonged, activity of nitrate and peroxide decreased, protein content increased by more than 50 %, velocity of leaf ageing slowed, but accumulation of dry matter of grain accelerated and 1000 - grain weight increased too
摘要稀植栽培的水稻,
抽穗后田間表現為中下部光強明顯增加,光合作用時間延長,硝酸還原酶和過氧化物酶活性降低,蛋白質含量增加50 %以上,
葉片衰老延緩,籽粒干物質積累加速,千粒重提高。
My fingers lingered almost un - consciously on the familiar leaves and blossoms which had just come forth to great the sweet southern spring
我的手指近乎下意識地撫弄著這些熟悉的
葉片和花朵,它們剛剛
抽葉開花,迎來南方溫馨的春天。
Based on 2 - d - optimum orthogonal design field experiment in the jointing - heading period of phleum pratense l., the results show that potassium content is the most productive on the seed yield, phosphorus comes next and nitrogen the least
摘要採用二因素d -飽和最優設計,通過貓尾草拔節
抽穗期的根氮、磷、鉀和莖
葉氮、磷、鉀的含量對其種子產量和產量因子進行灰關聯熵分析。
The trees put forth buds and leaves in spring
春天樹木
抽芽生
葉。
But the starting time and duration are very different from population to population, witn flowering being prior to sprouting in the population originated from jurong county
其中以引自於江蘇句容的半夏居群抽薹最早,且具「先花后葉」特性。