【正文】 超聲波，頻率低于20赫茲的聲波叫做次聲波。聲音控制技術(shù)是集聲音識別技術(shù)、聲音采集轉(zhuǎn)換技術(shù)和聲音檢測技術(shù)與一體的現(xiàn)代化控制技術(shù)。目前，聲音控制技術(shù)發(fā)展主要有兩個趨勢：其一是朝著體積小、速度快、功能強、價格低的微小型方向發(fā)展；其二是朝著高精度、智能化、數(shù)字化、網(wǎng)絡(luò)化、多功能方向發(fā)展。2理論淵源及演化早在我國古代就已經(jīng)有關(guān)于聲音運用的記載?？茖W技術(shù)的發(fā)展帶動了生產(chǎn)力的發(fā)展，對人類社會的發(fā)展作出了巨大貢獻，同時電子技術(shù)的不斷發(fā)展給我們帶來了越來越多的方便，跺腳發(fā)出的聲音就能讓樓道里的燈亮起來，對手機說出要撥打電話人的姓名，手機會自動接通相應的電話號碼，隨著科學技術(shù)的不斷進步，聲控技術(shù)給我們帶來了更大的方便。由電源電路分別為其他三個電路供電，電源電壓輸入為9V15V，電源電路中裝設(shè)一個三端穩(wěn)壓管L7806為整個電路提供穩(wěn)定的電壓6V，同時裝設(shè)一個二極管IN4007可防止電源極性接反而損壞三端穩(wěn)壓管。 作者簽名： 指導教師簽名：日期： 日期：  畢業(yè)論文（設(shè)計）答辯委員會(答辯小組)成員名單姓名職稱單位備注工學院自動化系主席（組長）工學院通信工程系工學院通信工程系工學院通信工程系 37 / 45摘要知識要學以致用，才能發(fā)揮它的最大作用。有權(quán)將論文（設(shè)計）用于非贏利目的的少量復制并允許論文（設(shè)計）進入學校圖書館被查閱。2013年度本科生畢業(yè)論文（設(shè)計）三段聲控電平顯示器的設(shè)計院 － 系： 工學院自動化系 專 業(yè)： 電氣工程及其自動化 年 級： 學生姓名： 學 號： 導師及職稱： 2013年5月2013Annual Graduation Thesis (Project) of the College UndergraduateDesign three sound level displayDepartment: College of engineeringMajor: Electrical engineering and automationGrade: Student’s Name:Student No.: Tutor: May, 2013畢業(yè)論文（設(shè)計）原創(chuàng)性聲明本人所呈交的畢業(yè)論文（設(shè)計）是我在導師的指導下進行的研究工作及取得的研究成果。 作者簽名： 日期： 畢業(yè)論文（設(shè)計）授權(quán)使用說明本論文（設(shè)計）作者完全了解紅河學院有關(guān)保留、使用畢業(yè)論文（設(shè)計）的規(guī)定，學校有權(quán)保留論文（設(shè)計）并向相關(guān)部門送交論文（設(shè)計）的電子版和紙質(zhì)版。 由音頻電路中的傳感器把聲音信號轉(zhuǎn)換成電信號，然后通過分頻電路把電信號分成不同的頻段，低頻為紅色，頻率為50400HZ，中頻綠色，頻率為50800HZ，高頻為藍色，頻率為1000HZ，然后根據(jù)各段頻率的大小由不同的驅(qū)動電路驅(qū)動相應的LED燈閃爍。關(guān)鍵詞：電平顯示器 頻率 聲控 安裝調(diào)試ABSTRACTKnowledge to apply what they have learned to play the biggest role. We have learned in the classroom is a book of knowledge, theoretical things, we only really used the actual order to play its role, which we need to hands to operate, integrate theory with practice, which for now college students bee more important. The facile introduction of three sections voice level display, the three sections of the voice level monitor circuit includes a power supply circuit, the audio circuit, the frequency divider circuit and a driving circuit constituting. Sound signal is converted into an electrical signal by the audio circuit in the sensor, and then passed through the frequency divider circuit, the electrical signal into different frequency bands, a low frequency of the red, 50400Hz frequency, IF green, a frequency of 50800Hz, highfrequency blue color, frequency to 1000 Hz, and then depending on the size of the frequency by a different driver circuit to drive the corresponding LED flashes. The other three circuit power supply, the power supply voltage input from the power circuit, respectively, for the installation of a threeterminal regulator L7806 for the entire circuit to provide a stable voltage 6V 9V15V, power supply circuit, while a diode IN4007 prevents installation of the power pole sexually but damage the threeterminal regulator. The first three paragraphs voice level monitor used in the original features and basic introduction, and then go through the different circuits in the display, the last simple installation and missioning of the process, as well as some should Note that some of the issues. Finally, under the careful guidance of the instructor, pleted the three paragraphs voice level monitor welding and missioning and successful operation.Key words: Level display Freque