本文關(guān)鍵詞： 無(wú)線通信 語(yǔ)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(jìn)步,越來(lái)越多的無(wú)線技術(shù)正快速應(yīng)用到各種產(chǎn)品中。無(wú)線傳輸方式與有線傳輸相比有著諸多優(yōu)點(diǎn)：無(wú)需架設(shè)電線,且覆蓋范圍廣,不受地理環(huán)境限制；語(yǔ)音信號(hào)的質(zhì)量很高,誤碼率很低；在出現(xiàn)故障時(shí)能快速找出原因,恢復(fù)正常運(yùn)行；安全保密性能好。在短距離的無(wú)線通信系統(tǒng)中,射頻技術(shù)因?yàn)楣牡秃蜔o(wú)方向性等優(yōu)點(diǎn)而受到青睞。在實(shí)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(shí)時(shí)操作系統(tǒng)的情況下難以解決可靠性和實(shí)時(shí)性問(wèn)題。基于這一背景,設(shè)計(jì)出了以無(wú)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(wú)線語(yǔ)音終端,利用nRF24E1芯片內(nèi)集成的射頻模塊和8051控制器,將語(yǔ)音數(shù)據(jù)以2.4GHz載波頻率進(jìn)行傳輸。 本文闡述了無(wú)線傳輸技術(shù)的發(fā)展歷程；簡(jiǎn)單介紹了語(yǔ)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(yǔ)音數(shù)據(jù)壓縮編碼類型,給出了一種無(wú)線語(yǔ)音傳輸系統(tǒng)的設(shè)計(jì)思路及實(shí)現(xiàn)方案,描述了項(xiàng)目背景和應(yīng)用價(jià)值。作為無(wú)線語(yǔ)音終端設(shè)計(jì)的一個(gè)核心,簡(jiǎn)要介紹了μC/OS-Ⅱ嵌入式操作系統(tǒng)的基本原理,詳細(xì)說(shuō)明了μC/OS-Ⅱ的移植和調(diào)試過(guò)程。對(duì)應(yīng)用任務(wù)總體設(shè)計(jì)進(jìn)行說(shuō)明,對(duì)系統(tǒng)的射頻芯片進(jìn)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(jì),并進(jìn)行了PCB板的設(shè)計(jì)與調(diào)試。詳述了無(wú)線語(yǔ)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(duì)本系統(tǒng)進(jìn)行了測(cè)試,驗(yàn)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(hào)：1519487