【導(dǎo)讀】快等優(yōu)點(diǎn)，在雷達(dá)及通信等領(lǐng)域有著廣泛的應(yīng)用前景。本文介紹了DDS(直接數(shù)字頻率。單片機(jī)控制，輔以必要的外圍電路，構(gòu)成一個(gè)輸出波形穩(wěn)定、精度較高的信號(hào)發(fā)生器。出單脈沖及雙脈沖，可以實(shí)現(xiàn)信號(hào)的調(diào)制，輸出PSK、ASK。軟件系統(tǒng)采用菜單形式進(jìn)。行操作，LCD液晶彩屏顯示，操作方便明了，還增加了很多功能。信號(hào)源起激勵(lì)作用，電路中的信號(hào)均由信號(hào)源所激勵(lì)，由激勵(lì)產(chǎn)生響應(yīng)。信號(hào)源對(duì)通信系統(tǒng)、電子對(duì)抗及各種電子測(cè)量技術(shù)十分重要。信號(hào)源的頻率穩(wěn)定度、準(zhǔn)確度以及頻譜純度提出越來越高的要求。技術(shù)是從相位概念出發(fā)直接合成所需波形的一種新的頻率合成技術(shù)。到廣泛的應(yīng)用，成為眾多系統(tǒng)中不可缺少的組成部分。調(diào)制，我們可以用高靈敏度的接收頭，里面有載波檢測(cè)電路，有抑制干擾的能力。整個(gè)系統(tǒng)上電后，單片機(jī)啟動(dòng)DDS，對(duì)LED進(jìn)行初始化，預(yù)制完畢后向單片機(jī)。發(fā)出一系列應(yīng)答，接著單片機(jī)讀取存儲(chǔ)器數(shù)據(jù)，送至LED顯示，然后進(jìn)入按鍵掃描中，

　　

【正文】 care about, over the past。 failing to do not frown, laugh it laugh. Results Don39。t demand, do to。 life is a simple, calm and peaceful. Always not to choose their own path and regret, life is like a train, the scenery and then the United States will retreat, the passage of time and encounter will eventually drifting further and further away, before is always himself. 25, everyone has a weakness, weakness is true humanity. That has no weakness, a shallow person. That people think there is no weakness, mostly false. Life has shortings, there are shortings is the real life. That no 多功能信號(hào)發(fā)生器 24 one regret, or childish or numbness or Self deception. It is in tolerance of weakness and so on to accept, people live happily. Hello, everyone! I am a party member. The title of my speech is: study and implement the party39。s two laws, doing practical play highway. 2020 October 18, the Central Committee of the Communist Party of China promulgated the implementation of the the probity of the Communist Party of China selfdiscipline criterion and Chinese Communist Party discipline and punishment regulations. We Heyuan male passersby to respond positively to the call of the Central Committee of the party, earnestly anize the study party two regulations, truly grasp the essence and gist, and in their respective positions, to hold the bottom line of the discipline, build a strong ideological line of defense, with the courage to play, the courage to fight tough and fearless spirit, at the crucial moment well to plete the task, with practical action to test the study and implement effect Because of discipline in the * * * * * * * * * * * story. Here, let me to cast a brick to attract jade, speak about our highway. Highway line section of the road surface transformation project, last year towards the country 多功能信號(hào)發(fā)生器 25 seized will be seized one of the items. To plete this arduous task, as a project management office director Comrade, keep in mind from the Communist Party membership, recognize and identify the bottom line, strict management, and strict adherence to the quality of the project. He not only set an example, honesty and selfdiscipline, but also requires the management of all the members of the ., do not eat the construction unit one meal, do not accept the construction unit a ceremony. In this way, they didn39。t really dare to adhere to the principle. No rade, constantly put on reworking an emergency meeting to Comrade Zhen to speak louder, management tube too strict. Remember in Dongguan Street, 400 meters long cement concrete surface layer, because of various reasons, the smoothness of the poor in the bottom cavity, covering film traces and car imprinting quality problems, * * * inquiries, immediately rushed to the scene to understand and verify the situation, the convening of the management office, the construction units, supervision units, construction units, construction units construction time is tight, the economic loss and other reasons to intercede ******** unmoved. He said, now a popular word, to the discipline and rules quite in front, there are no rules Radius, you construction team not accordance 多功能信號(hào)發(fā)生器 26 with the technical specifications, quality problems, it must be to carry out rectification. Engineering quality responsibility be weightier than Mount Tai, if we manage to this matter Pavement quality quantity are placed the matter, we this time to learn two regulations have what use? Still what is the Communist Party? Finally, in his insisted, the road after rework, to solve these problems. In the construction of the new rades and the project all the colleagues efforts, after four months of fighting, the project the main project was finally pleted and passed inspection. Thousands of miles of ice, thousands of miles Piao, this is a splendid and romantic scene. But snow for the highway, it is a disaster, a serious threat to the traffic safety. This year, a month, a century of cold wave swept from North to south, and the snow blowing to Guangdong, but also to bear the blow To * * * * the highway. In January on the evening of 23, Lianping county city temperatures dropped to minus 2 degrees, a wide range of sudden rain sleet, before and after the provincial S341 line in Jiulianshan Mountain tunnel sections of the road appeared in the snow, lead to the passing vehicles skid, traffic is blocked. In the face of the sudden natural disasters, city and county 多功能信號(hào)發(fā)生器 27 highway department immediately launched the emergency plan for disaster prevention. As the front line of the main force, Lianping Highway Bureau of all Party members and cadres to remember the Party member responsibility, braving the biting cold wind, the first time rushed to the scene, on the icy pavement of salt disposal. Because the temperature is too low, just melt water immediately freezes, addition to the ice work to increase the difficulty. To ensure In addition to the re anization of the depths of the traffic safety, road people braved the icy put reflective cones and warning signs, endure cold at minus 2,3 of Jiulianshan patrols until one in the morning. Just before dawn, Lianping Highway Bureau personnel on the icy road salt ice melting processing until ten o39。clock, ice melting ice success, the road gradually returned to normal traffic. In the cold winter night, which people do not miss the warm bed, which people do not miss the warm home. However, our highway on the road to the owners of the masses can go home early, the night fighting to secure the avoidance of the road safety and smoothness, fulfill their responsibility. Xi General Secretary Every Party member cadre cautioned against said: blacksmith needs self hard . two regulations , is our own hard standard test, more exercise every part