Data Transmission using Audio Channel

Hi Gang,

there is a interesting project :

[url removed, login to view] offers a kind of data-transmission over a audio channels. There

are also smartphone Apps available - see [url removed, login to view] So basically you are

able to transfer short messages between smartphones using the microphone + loudspeaker

over a short distance.

The scope of the project is to built a similar think (just the audio transmission

solution, not all the other rest).

We are looking for a smartphone-to-smartphone audio communication over the audio channel that

sounds like "birds tweeting" while transmitting. Pls try the above smartphone

Apps to see what I;m talking about.

Technically considered this is a :

- FSK modulation (but I;m open for other ideas)

- 50 Bits of data (in general only few bytes should be transmitted, maximim transmission time just a few seconds)

- Reed-Solomon Codes

- See for details [url removed, login to view]

- The parameters does not need 1:1 like chirp.io. We are not looking for a "copy", just a kind of inspiration.

The real challenge on this task is to make the transmission sound like birds tweeting.

One aspect that also [url removed, login to view] has used is to use "puretones" that are known from the

"music" notes - [url removed, login to view] But there is more.

The delivery goal would be :

- A working code for transmitting of arbitrary data using a audio interface (one way, A to B, B to A is not required)

- Nice would be a Java Code that runs on Android, but I;m open for other solutions.

- The usage of Reed-Solomon Codes for error corrections (e.g. [url removed, login to view])

- Signal/Noise consideration (evtl. some Matlab Code for simulations ?)

Please bid only when you know what would be required. This means you are potentially a

export in the high-frequency domain, you know about topics like DSP, FFT, digital filtering, etc.

The goal is not to have a "only" a FSK based transmission using from A to B, but while transmitting

the user has the impression that some birds are tweeting.. :-)

Cheers,

jj

Some another useful links :

[url removed, login to view]

[url removed, login to view]

Servicios de audio Biología Ingeniería eléctrica Software integrado Desarrollo de apps móviles

Nº del proyecto: #5517136

Sobre el proyecto