基于AOA协议的Android音频配件研究与实现

发布时间：2018-04-30 04:12

本文选题：音频配件 + Android　；参考：《东北大学》2014年硕士论文

【摘要】：随着Android开放配件协议的开放,Android设备可以方便的访问外设,形成强大的Android配件系统。由于Android音频配件越来越受到消费者的青睐,Android开放配件(AOA, Android Open Accessory)协议专门为音频配件开发提供支持。本课题主要通过对AOA协议与音频配件技术的研究,提出了一种新的Android音频配件解决方案。AOA协议规定Android设备可以通过USB接口与配件通信,实现AOA协议的配件均可实现Android设备的访问。本课题通过对AOA协议核心内容、主要技术以及应用场景的研究,结合音频配件的需求,设计并实现了通过USB进行Android设备与音频配件间的音频传输功能。此外,本课题通过对蓝牙技术、USB大容量存储协议以及SD协议的研究,设计实现蓝牙、U盘与SD卡音频播放功能。对于音频配件来讲,AOA音频、蓝牙音频、U盘音频和SD卡音频构成了四种音频数据源,音频配件通过对不同数字音频源数据解码,将解码后的音频数据输送到集成的高品质声卡。根据音频源不同,音频配件包含四种播放模式：AOA模式、蓝牙模式、U盘模式以及SD卡模式。本课题为每种模式设定了优先级,实现了多种音频源就绪情况下的音频源选择。通过对本课题软硬件开发平台需求分析以及对多家厂商软硬件开发平台对比,最终选用飞思卡尔公司Kinetis系列K70高性能MCU进行配件开发,选取SGTL 5000实现音频输出。本课题音频配件引入AOA协议支持,实现了一种新的数字音频传输方式,打破了市面上音频配件只支持蓝牙无线连接以及存储卡本地播放的局面。本课题涉及的关键技术有Android开放配件协议、蓝牙高级音频传输协议、USB大容量存储协议以及SD协议等。
[Abstract]:With the opening of Android Open Accessories Protocol, Android devices can easily access peripherals and form a powerful Android accessory system. Because Android audio accessories are becoming more and more popular among consumers, Android Open Accessory is dedicated to support audio accessories development. Based on the research of AOA protocol and audio accessory technology, this paper proposes a new Android audio accessory solution. AOA protocol stipulates that Android equipment can communicate with accessories through USB interface. The accessories that realize AOA protocol can realize the access of Android device. Through the research of the core content, main technology and application scene of AOA protocol, combining with the requirement of audio accessories, this paper designs and realizes the audio transmission function between Android equipment and audio accessories through USB. In addition, through the research of Bluetooth technology, USB mass storage protocol and SD protocol, the audio playback function of Bluetooth, U disk and SD card is designed and realized. For audio accessories, AOA audio, Bluetooth audio, U disk audio and SD card audio constitute four kinds of audio data sources. Audio accessories transmit the decoded audio data to integrated high quality sound card by decoding different digital audio source data. Depending on the audio source, the audio accessory includes four playback modes: AOA mode, Bluetooth mode, U disk mode, and SD card mode. In this paper, priority is set for each mode, and audio source selection is realized when many audio sources are ready. By analyzing the requirement of the software and hardware development platform and comparing the software and hardware development platform of many manufacturers, the author chooses Kinetis K70 high performance MCU of Freescale Company to carry on the accessory development, and selects the SGTL 5000 to realize the audio output. In this paper, AOA protocol is introduced into audio accessories to realize a new digital audio transmission mode, which breaks the situation that audio accessories only support Bluetooth wireless connection and local playback of memory card. The key technologies involved in this thesis include Android Open Accessories Protocol, Bluetooth Advanced Audio transfer Protocol, USB Mass Storage Protocol, SD Protocol and so on.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP316;TN915.04

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