【摘要】：隨著移動設(shè)備的普及,大家對于近距離數(shù)據(jù)傳輸?shù)男枨笤絹碓綇娏�；目前已�?jīng)存在多種近距離數(shù)據(jù)傳輸方式,例如藍牙、NFC (Near Field Communication近場通信)等；但是通過藍牙進行傳輸,操作步驟比較復雜,NFC又需要額外的硬件支持,普及率也很低；特別對于即興的小數(shù)據(jù)的傳輸,采用現(xiàn)有的方式,都不夠簡便。 本文采用一種音頻信號的方式,可以很簡便地進行近距離數(shù)據(jù)傳輸；而且這種方法對硬件要求非常低,只需要揚聲器和麥克風,所以適用的范圍非常廣泛；該方法的技術(shù)原理和DTMF (Dual Tone Multi Frequency雙音多頻)類似,但是DTMF采用的頻段和人發(fā)聲的頻段重疊,抗干擾性比較差,而且每個音頻信號攜帶的數(shù)據(jù)量也比較低,如何有效地提高識別率以及傳輸速率是本技術(shù)的關(guān)鍵。本文對音頻信號數(shù)據(jù)傳輸?shù)年P(guān)鍵技術(shù)進行了分析和描述,主要包括數(shù)字頻率的合成技術(shù)、基于快速傅里葉變換的頻譜分析技術(shù)、糾錯算法和安卓NDK技術(shù)等。本文對基于音頻信號的近距離數(shù)據(jù)傳輸系統(tǒng)進行了需求分析,介紹了系統(tǒng)的設(shè)計目標和功能需求,并以此為依據(jù)設(shè)計了系統(tǒng)的整體架構(gòu)和工作流程,在此基礎(chǔ)上詳細設(shè)計并實現(xiàn)了基于音頻信號的近距離數(shù)據(jù)傳輸系統(tǒng),該系統(tǒng)包括基礎(chǔ)框架、發(fā)送端和接收端三個部分,其中基礎(chǔ)框架為整個系統(tǒng)提供基礎(chǔ)框架和服務,包括RS Codec、頻率映射和配置信息；發(fā)送端部分主要負責數(shù)據(jù)的發(fā)送,包括數(shù)據(jù)編碼、音頻合成和音頻發(fā)射；接收端部分主要負責數(shù)據(jù)的接收,包括音頻采集、音頻識別和數(shù)據(jù)解碼。本文對測試應用和已上線應用分別進行測試驗證,并對發(fā)送端和接收端的實際應用效果進行了分析和展示。 本論文設(shè)計并實現(xiàn)的“基于音頻信號的近距離數(shù)據(jù)傳輸系統(tǒng)”在近距離即興傳輸方面,非常簡單易用,同時該系統(tǒng)作為一個子模塊,可以融入到各種應用場景,例如名片交換、電子支付、通知廣播等等,給用戶的生活帶來極大的便利。
[Abstract]:With the popularity of mobile devices, the demand for close-range data transmission has become more and more intense. At present, there are many close data transmission methods, such as Bluetooth, NFC (Near Field Communication near-field communication, etc. However, Bluetooth transmission, the operation steps are more complex, NFC needs additional hardware support, the penetration rate is also very low; especially for impromptu small data transmission, using the existing methods, are not simple enough. In this paper, a kind of audio signal is adopted, which can easily transmit data in close range, and this method requires very low hardware requirement, only requires loudspeakers and microphones, so it has a wide range of applications. The technical principle of this method is similar to that of DTMF (Dual Tone Multi Frequency, but the frequency band used by DTMF overlaps with that of human voice, and the anti-jamming ability of this method is poor, and the amount of data carried by each audio signal is relatively low. How to effectively improve the recognition rate and transmission rate is the key of this technology. This paper analyzes and describes the key technologies of audio signal data transmission, including digital frequency synthesis technology, spectrum analysis technology based on fast Fourier transform, error correction algorithm and Android NDK technology. In this paper, the requirements of the short distance data transmission system based on audio signal are analyzed, and the design objectives and functional requirements of the system are introduced. Based on this, the overall architecture and workflow of the system are designed. On this basis, the paper designs and implements a close distance data transmission system based on audio signal in detail. The system includes three parts: the basic framework, the transmitter and the receiver, in which the basic framework provides the basic framework and services for the whole system. Including RS Codec, frequency mapping and configuration information; The transmitter is mainly responsible for data transmission, including data encoding, audio synthesis and audio transmission, while the receiver is mainly responsible for receiving data, including audio acquisition, audio recognition and data decoding. In this paper, the test application and the on-line application are tested and verified, and the actual application effect of the transmitter and receiver is analyzed and demonstrated. In this paper, the design and implementation of "close distance data transmission system based on audio signal" is very simple and easy to use in the area of close-over improvisation transmission. As a sub-module, the system can be integrated into various application scenarios, such as card exchange. Electronic payment, notification broadcast and so on, bring great convenience to the user's life.
【學位授予單位】：中國科學院大學（工程管理與信息技術(shù)學院）
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN912.34

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