【摘要】：DRM(Digital Radio Mondiale)系統(tǒng)是頻率在30MHz以下的多媒體數(shù)字無線廣播系統(tǒng)。DRM采用OFDM調(diào)制方式和多級信道編碼,信源編碼等通信領(lǐng)域新技術(shù),既充分利用了30MHz以下廣播頻段覆蓋范圍廣、傳播距離遠(yuǎn)的優(yōu)勢,又克服了傳統(tǒng)的模擬調(diào)幅廣播抗干擾能力差,發(fā)射功率大,業(yè)務(wù)單一等固有技術(shù)缺陷。在與模擬調(diào)幅廣播同樣的帶寬(9 k或10 kHz)下實(shí)現(xiàn)了調(diào)頻的音質(zhì),而且在音頻業(yè)務(wù)的基礎(chǔ)上增加了文本、圖像等附加的數(shù)據(jù)業(yè)務(wù),豐富了調(diào)幅廣播的內(nèi)容。 DRM信源解碼和數(shù)據(jù)業(yè)務(wù)解碼的正確實(shí)現(xiàn)決定了用戶能否得到質(zhì)量良好的音頻以及豐富的增值業(yè)務(wù),因此信源解碼和數(shù)據(jù)業(yè)務(wù)解碼的研究與實(shí)現(xiàn)對DRM接收機(jī)的整體實(shí)現(xiàn)具有重要的意義。此外,目前的接收機(jī)多為專用接收機(jī)和軟件接收機(jī),為數(shù)不多的便攜式接收機(jī)也由于實(shí)現(xiàn)復(fù)雜而價(jià)格過高,并沒有真正的實(shí)現(xiàn)大范圍推廣,因此研究DRM嵌入式接收機(jī)系統(tǒng)具有重要的實(shí)際應(yīng)用意義。 本文介紹了DRM系統(tǒng)音頻業(yè)務(wù)解碼以及數(shù)據(jù)業(yè)務(wù)中文本信息和靜態(tài)圖片解碼的原理和實(shí)現(xiàn)方法,并介紹了DRM系統(tǒng)的信道估計(jì)、FFT解調(diào)以及l(fā)inux系統(tǒng)下音頻播放功能的實(shí)現(xiàn)方法。本文的開發(fā)平臺是基于DM3730內(nèi)核的Beagleboard-xM嵌入式開發(fā)平臺,該平臺集成了功能強(qiáng)大的主頻1GHz的ARMCortex-A8內(nèi)核和主頻800MHz的TMS320C64+數(shù)字信號處理器,適合作為DRM軟件接收機(jī)平臺。論文基于該平臺實(shí)現(xiàn)了linux系統(tǒng)下的DRM嵌入式接收機(jī)的音頻解碼和數(shù)據(jù)解碼,通過軟件優(yōu)化,成功的在嵌入式開發(fā)板上得到清晰流暢的音樂和語音節(jié)目,解碼后得到的音頻文件與編碼前的源文件比較,證明其誤比特率性能良好。
[Abstract]:DRM (Digital Radio Mondiale) system is a multimedia digital radio broadcasting system with frequency below 30MHz. DRM adopts new communication technologies such as OFDM modulation mode, multilevel channel coding, source coding and so on, which make full use of the wide coverage of broadcast frequency band below 30MHz. The advantage of long propagation distance overcomes the inherent technical defects of traditional analog AM broadcasting, such as poor anti-jamming ability, large transmitting power, single service, and so on. In the same bandwidth (9 k or 10 kHz) as analog AM broadcast, the FM sound quality is realized, and the additional data services such as text and image are added to the audio service, which enriches the content of AM broadcast. The correct implementation of DRM source decoding and data service decoding determines whether the user can get good quality audio and rich value-added services. Therefore, the research and implementation of source decoding and data decoding is of great significance to the overall implementation of DRM receiver. In addition, most of the current receivers are dedicated receivers and software receivers, and a small number of portable receivers are expensive because of the complexity of their implementation, and have not really been widely promoted. Therefore, the study of DRM embedded receiver system has important practical significance. This paper introduces the principle and implementation method of audio service decoding in DRM system, Chinese text information and static picture decoding of data service. It also introduces the channel estimation of DRM system, FFT demodulation and the realization of audio playback function in linux system. The development platform of this paper is the Beagleboard-xM embedded development platform based on the DM3730 kernel. The platform integrates the ARMCortex-A8 kernel of the main frequency 1GHz and the TMS320C64 digital signal processor of the main frequency 800MHz, and is suitable for the DRM software receiver platform. Based on this platform, the audio decoding and data decoding of DRM embedded receiver in linux system are realized. Through software optimization, clear and smooth music and voice programs are successfully obtained on the embedded development board. The comparison between the decoded audio file and the source file shows that the bit error rate (BER) is good.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP368.1;TN851

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