The data is encoded with a single frequency sound signal, and then the single frequency sound is played. The receiver recognizes the frequency after receiving the sound and then decodes the data according to the frequency.

sonic-master
............\.gitignore
............\LICENSE
............\README.md
............\android
............\.......\sample
............\.......\......\.classpath
............\.......\......\.cproject
............\.......\......\.project
............\.......\......\AndroidManifest.xml
............\.......\......\ic_launcher-web.png
............\.......\......\jni
............\.......\......\...\Android.mk
............\.......\......\...\Application.mk
............\.......\......\...\DCRejectionFilter.cpp
............\.......\......\...\DCRejectionFilter.h
............\.......\......\...\SonicGenerator.cpp
............\.......\......\...\SonicListener.cpp
............\.......\......\...\com_duowan_sonic_SonicGenerator.h
............\.......\......\...\com_duowan_sonic_SonicListener.h
............\.......\......\proguard-project.txt
............\.......\......\project.properties
............\.......\......\res
............\.......\......\...\drawable-hdpi
............\.......\......\...\.............\ic_launcher.png
............\.......\......\...\drawable-mdpi
............\.......\......\...\.............\ic_launcher.png
............\.......\......\...\drawable-xhdpi
............\.......\......\...\..............\ic_launcher.png
............\.......\......\...\drawable-xxhdpi
............\.......\......\...\...............\ic_launcher.png
............\.......\......\...\layout
............\.......\......\...\......\activity_main.xml
............\.......\......\...\menu
............\.......\......\...\....\main.xml
............\.......\......\...\values-sw600dp
............\.......\......\...\..............\dimens.xml
............\.......\......\...\values-sw720dp-land
............\.......\......\...\...................\dimens.xml
............\.......\......\...\values-v11
............\.......\......\...\..........\styles.xml
............\.......\......\...\values-v14
............\.......\......\...\..........\styles.xml
............\.......\......\...\values
............\.......\......\...\......\dimens.xml
............\.......\......\...\......\strings.xml
............\.......\......\...\......\styles.xml
............\.......\......\src
............\.......\......\...\com
............\.......\......\...\...\duowan
............\.......\......\...\...\......\sonic
............\.......\......\...\...\......\.....\MainActivity.java
............\.......\......\...\...\......\.....\SonicGenerator.java
............\.......\......\...\...\......\.....\SonicListener.java
............\ios
............\...\SonicDemo
............\...\.........\SonicDemo.xcodeproj
............\...\.........\...................\project.pbxproj
............\...\.........\SonicDemo
............\...\.........\.........\AppDelegate.h
............\...\.........\.........\AppDelegate.mm
............\...\.........\.........\Images.xcassets
............\...\.........\.........\...............\AppIcon.appiconset
............\...\.........\.........\...............\..................\Contents.json
............\...\.........\.........\...............\LaunchImage.launchimage
............\...\.........\.........\...............\.......................\Contents.json
............\...\.........\.........\MainViewController.h
............\...\.........\.........\MainViewController.mm
............\...\.........\.........\MainViewController.xib
............\...\.........\.........\SonicDemo-Info.plist
............\...\.........\.........\SonicDemo-Prefix.pch
............\...\.........\.........\WaveListener
............\...\.........\.........\............\WaveListener.h
............\...\.........\.........\............\WaveListener.mm
............\...\.........\.........\............\aurio_helper.cpp
............\...\.........\.........\............\aurio_helper.h
............\...\.........\.........\en.lproj
............\...\.........\.........\........\InfoPlist.strings
............\...\.........\.........\iPublicUtility
............\...\.........\.........\..............\CABitOperations.h
............\...\.........\.........\..............\CADebugMacros.cp

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