But many cash - strapped local officials have chronically underfunded such long - to - germinate human investment and focused instead on short - term , revenue - generating schemes 今天,中國是唯一一個(gè)將醫(yī)療、社會(huì)安全和教育的責(zé)任放在地方政府的手里的國家。
Meanwhile , the implementation of the concept involves a procedure that contrasts , restores , and refers to its generating scheme in a special environment , which will be called its application scheme 概念,或標(biāo)識它的詞語的義項(xiàng),只有在產(chǎn)生它的特定圖式中才能描述、定義清楚。
A signal - generated scheme that is used in high solution ac source is presented based on the reasonable usage of system source . by discussing the methods of counter - output , pll ( phase - locked loop ) - output and dds ( direct digital synthesization ) - output , dds - based dummy - space method is brought out and it converts the time problem into space , improves the resolution of both frequency and phase - shift 通過對計(jì)數(shù)器輸出法、基于鎖相環(huán)單片機(jī)合成及基于dds ( directdigitalsynthesization )的單片機(jī)合成幾種方法的討論,引出一種基于dds的虛擬空間法,將時(shí)間上所面臨的問題轉(zhuǎn)化到內(nèi)存空間上進(jìn)行處理,極大地提高了交流電源的調(diào)頻、移相精度。
The thesis then introduces top - to - bottom schemes , which discuss the functional design of hdtv test pattern signal generator according to the tasks and platform of the system , and develops the function of subsystems . the thesis analyses the theory and mathematic model of hdtv test signal , and studies the signal generating scheme called single - fpga and multi - prom , and describes in detail its key modules such as configuration connecting , prom routing , control and switch timing design and so on . the single - fpga and multi - prom scheme increases the number of prom to reduce the degree of fpga demanded , thus 論文分析了hdtv測試信號的原理及數(shù)理模型,提出了一種以單芯片多配置為特色的信號生成方案,并對該方案的配置連接、芯片選路、控制切換時(shí)序設(shè)計(jì)等關(guān)鍵模塊進(jìn)行了詳細(xì)敘述,該方案以增加配置芯片數(shù)量來降低對主芯片要求,不但降低了產(chǎn)品成本,還使各測試信號的代碼編寫和產(chǎn)生相對獨(dú)立,有利于合理使用芯片資源,實(shí)現(xiàn)多種復(fù)雜的hdtv測試信號,縮短開發(fā)周期。