水印声音,通过 iPhone 阅读
我想向声音文件(例如歌曲)添加几个字节的数据。声音文件将通过无线电传输到接收者,接收者使用 iPhone 麦克风等来拾取声音,应用程序将显示原始数据字节。最好是人类听不到它的声音。
这种技术叫什么?有没有任何应用程序可以做到这一点? 可以在 iPhone 上使用的库/应用程序?
I want to add a few bytes of data to a sound file (for example a song). The sound file will be transmitted via radio to a received who uses for example the iPhone microphone to pick up the sound, and an application will show the original bytes of data. Preferably it should not be hearable for humans.
What is such technology called? Are there any applications that can do this?
Libraries/apps that can be used on iPhone?
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我做了一些研究,看来可行的方法是:
我正在编写一个原型,但在拾取正确的频率方面遇到了一些困难,就好像有 ~4 Hz 偏移一样(当播放并由麦克风拾取时,100 Hz 变为 96.x Hz)。
这不是答案,但我希望它有所帮助。
I've done some research, and it seems the way to go is:
I'm writing a prototype and am having a bit difficulty in picking up the right frequency as if has a ~4 Hz offset (100 Hz becomes 96.x Hz when played and picked up by the microphone).
This is not the answer, but I hope it helps.
这是音频隐写术。有一些算法可以做到这一点。请参阅此处。
It's audio steganography. There are algorithms to do it. Refer to here.