基于音频信号的近距离数据传输系统设计与实现
发布时间：2019-02-14 16:41
【摘要】：随着移动设备的普及,大家对于近距离数据传输的需求越来越强烈；目前已经存在多种近距离数据传输方式,例如蓝牙、NFC (Near Field Communication近场通信)等；但是通过蓝牙进行传输,操作步骤比较复杂,NFC又需要额外的硬件支持,普及率也很低；特别对于即兴的小数据的传输,采用现有的方式,都不够简便。 本文采用一种音频信号的方式,可以很简便地进行近距离数据传输；而且这种方法对硬件要求非常低,只需要扬声器和麦克风,所以适用的范围非常广泛；该方法的技术原理和DTMF (Dual Tone Multi Frequency双音多频)类似,但是DTMF采用的频段和人发声的频段重叠,抗干扰性比较差,而且每个音频信号携带的数据量也比较低,如何有效地提高识别率以及传输速率是本技术的关键。本文对音频信号数据传输的关键技术进行了分析和描述,主要包括数字频率的合成技术、基于快速傅里叶变换的频谱分析技术、纠错算法和安卓NDK技术等。本文对基于音频信号的近距离数据传输系统进行了需求分析,介绍了系统的设计目标和功能需求,并以此为依据设计了系统的整体架构和工作流程,在此基础上详细设计并实现了基于音频信号的近距离数据传输系统,该系统包括基础框架、发送端和接收端三个部分,其中基础框架为整个系统提供基础框架和服务,包括RS Codec、频率映射和配置信息；发送端部分主要负责数据的发送,包括数据编码、音频合成和音频发射；接收端部分主要负责数据的接收,包括音频采集、音频识别和数据解码。本文对测试应用和已上线应用分别进行测试验证,并对发送端和接收端的实际应用效果进行了分析和展示。 本论文设计并实现的“基于音频信号的近距离数据传输系统”在近距离即兴传输方面,非常简单易用,同时该系统作为一个子模块,可以融入到各种应用场景,例如名片交换、电子支付、通知广播等等,给用户的生活带来极大的便利。
[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.
【学位授予单位】：中国科学院大学（工程管理与信息技术学院）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN912.34
本文编号：2422398
[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.
【学位授予单位】：中国科学院大学（工程管理与信息技术学院）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN912.34
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