本文關(guān)鍵詞： 無線通信 語音終端 μC/OS-Ⅱ nRF24E1　出處：《電子科技大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著科技的進步,越來越多的無線技術(shù)正快速應(yīng)用到各種產(chǎn)品中。無線傳輸方式與有線傳輸相比有著諸多優(yōu)點：無需架設(shè)電線,且覆蓋范圍廣,不受地理環(huán)境限制；語音信號的質(zhì)量很高,誤碼率很低；在出現(xiàn)故障時能快速找出原因,恢復(fù)正常運行；安全保密性能好。在短距離的無線通信系統(tǒng)中,射頻技術(shù)因為功耗低和無方向性等優(yōu)點而受到青睞。在實際應(yīng)用中,通信系統(tǒng)的任務(wù)大部分都比較復(fù)雜,不引入實時操作系統(tǒng)的情況下難以解決可靠性和實時性問題。基于這一背景,設(shè)計出了以無線通信收發(fā)芯片nRF24E1為核心、基于μC/OS-Ⅱ嵌入式操作系統(tǒng)的全雙工無線語音終端,利用nRF24E1芯片內(nèi)集成的射頻模塊和8051控制器,將語音數(shù)據(jù)以2.4GHz載波頻率進行傳輸。 本文闡述了無線傳輸技術(shù)的發(fā)展歷程；簡單介紹了語音壓縮編碼的發(fā)展歷史、研究現(xiàn)狀和波形編碼、參數(shù)編碼和混合編碼三種語音數(shù)據(jù)壓縮編碼類型,給出了一種無線語音傳輸系統(tǒng)的設(shè)計思路及實現(xiàn)方案,描述了項目背景和應(yīng)用價值。作為無線語音終端設(shè)計的一個核心,簡要介紹了μC/OS-Ⅱ嵌入式操作系統(tǒng)的基本原理,詳細(xì)說明了μC/OS-Ⅱ的移植和調(diào)試過程。對應(yīng)用任務(wù)總體設(shè)計進行說明,對系統(tǒng)的射頻芯片進行細(xì)致分析與比較,確定了硬件電路方案。完成了nRF24E1及天線電路、音頻預(yù)處理及放大電路和音頻輸出電路的設(shè)計,并進行了PCB板的設(shè)計與調(diào)試。詳述了無線語音通信系統(tǒng)的通信協(xié)議；給出系統(tǒng)初始化、音頻輸入和數(shù)據(jù)發(fā)送、數(shù)據(jù)接收和音頻輸出、跳頻和地址變換模塊的程序流程圖和主要代碼。最后對本系統(tǒng)進行了測試,驗證了該方案的可行性。
[Abstract]:With the development of science and technology, more and more wireless technologies are rapidly applied to various products. Compared with wired transmission, wireless transmission mode has many advantages: no need to set up wires, wide coverage, not limited by geographical environment; The quality of speech signal is very high, the bit error rate is very low, the cause can be quickly found in the event of failure, and the normal operation can be resumed. Radio frequency technology is favored for its advantages of low power consumption and non-directionality. In practical applications, most of the tasks of communication systems are complex. It is difficult to solve the problem of reliability and real-time without the introduction of real-time operating system. Based on this background, a full-duplex wireless voice terminal based on 渭 C / OS- 鈪，

本文編號：1519487