基于51單片機(jī)的多功能門(mén)鈴的設(shè)計(jì)外文資料翻譯-資料下載頁(yè)
【導(dǎo)讀】確，符合畢業(yè)設(shè)計(jì)的規(guī)范化要求。音通信進(jìn)行了設(shè)計(jì)和實(shí)現(xiàn)，分析了數(shù)字語(yǔ)音在傳輸中的處理，討論了幀結(jié)構(gòu)的設(shè)計(jì)，有力的技術(shù)支撐。統(tǒng)，它可以用來(lái)在智能化住宅小區(qū)。我們強(qiáng)調(diào)在傳送數(shù)字化語(yǔ)音過(guò)程中，并討論了結(jié)構(gòu)設(shè)。計(jì)的框架，以及幀同步實(shí)現(xiàn)的CPLD。最后，測(cè)試結(jié)果表明，一個(gè)穩(wěn)定和可靠的質(zhì)。量，清晰的語(yǔ)音和相當(dāng)?shù)膶?shí)用價(jià)值。全防范裝置得到了廣泛應(yīng)用。無(wú)線可視對(duì)講門(mén)鈴系統(tǒng)結(jié)合微機(jī)技術(shù)、無(wú)線通信技。否開(kāi)門(mén)接待，保障家庭的人身和財(cái)產(chǎn)安全L該系統(tǒng)采用模數(shù)混合技術(shù)，即語(yǔ)音數(shù)字，信號(hào)處理模塊、單片機(jī)AT89C51，顯示屏和接收模塊及無(wú)線收發(fā)模塊等組成。號(hào)難于接收，處理的要求比模擬信號(hào)更為嚴(yán)格。特編碼或采用DPCM方式發(fā)送，并對(duì)數(shù)據(jù)進(jìn)行校驗(yàn)。有一個(gè)呼叫按鍵，所以我們?cè)O(shè)計(jì)時(shí)，將幀同步碼后的一個(gè)字節(jié)留給傳輸控制信號(hào)，塊、接受模塊、數(shù)字鎖相環(huán)和幀狀態(tài)機(jī)。塊是為了發(fā)送數(shù)據(jù)，在原始數(shù)據(jù)前添加幀頭，語(yǔ)音通信的幀頭為0x99，0xCC，0xCC，
【正文】 and launch two factors constraints, we do not have to deal with plicated coding. 0 x99 precursor for which code for the initial bit synchronization and receive state machine reset, 0xCCCCCC data frame synchronization code, frame synchronization for eight yards behindcontrol code. Visual Round wireless doorbell system in the control code number of small, indoor to outdoor is three, has taken the initiative to monitor the lock, removable hang up. Outdoor to indoor control signal only a call button, we will design the frame synchronization byte code for the control signal transmission in the back to keep up with the control signal in bytes of voice and data units. Software using topdown design methodology, a total of five documents: the toplevel documents were, transmit modules accept modules, digital phaselocked loop and frame state machine. Toplevel document for the system clock with a 2048 kHz voice codec interface chip MC145481, including sending and receiving of two functional modules L module which is sent to send data in the original data before adding header, voice munications frame 0x99 first, 0xCC, 0xCC, 0xCC, followed by the control signal byte, in bytes of voice and data units for L receiver module is to detect and control the speech signal, the relatively plex, including digital phaselocked loop and frame status twostate, if detected 0xCC, 0 from the state into a state if a byte is 0xCC from a state into two states, or else to return to state 0。 If the first three bytes or 0xCC from entering the state 2 3 state into synchronous state, or to return to state 0 which DPLL is a bit synchronization. As voice signals are relatively weak in general, according to M u/A code of law, may be even longer, 1, so that the receiver can not extract the correct information in sync, so we carried out a simple voice and data handling, even if 1 is greater than the number eight, an eighth reverse, namely, 1 to 0. As one of the quantitative data sampling points last a minimum weights, this will not deal with the impact of. Last: Concluding remarks Based on the visualspeaking wireless doorbell system, and its twoway voice munications for the design and realization, it is has been tested and empty distance of 60 m, 30 m to obstructions, clear voice L test results show that the design of a performance stable and reliable, voice clear, simple design, and other features, the value of L practical course of the programme in this paper on the properties have yet to be improved, then we have to do the work is the image of realtime digital information transmission, thus achieving alldigital wireless Visualization Round doorbell system.
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