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 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.. :-)



Some another useful links :

[url removed, login to view]

[url removed, login to view]

Skills: Audio Services, Biology, Electrical Engineering, Embedded Software, Mobile App Development

See more: data transmission using audio channel, wiki challenge, wiki android, what you need to transfer domain, what is engineering all about, what is be electrical engineering, using google apps, useful apps for android, useful android apps, transfer domain to google sites, transfer domain to google, technology solutions code, tech data, tech code solutions, real time data solutions, notes in google apps, music notes com, music audio com, music apps for android, mobile apps technology

About the Employer:
( 2 reviews ) Zug, Germany

Project ID: #5517136

8 freelancers are bidding on average $1662 for this job


Hi, I'm an expert ios and android app developer with 5+ years of experience. I am an expert in Native Android SDK,objective c, HTML5, Database(MySQL,MSSQL),CSS,DHTML,JQuery,etc. I believe my skills would be ideal More

$2989 USD in 20 days
(12 Reviews)

Hi, I have read your requirement carefully. I am an iPhone | Android software expert with rich experience. I have done many successful iPhone | android apps and games: single, multi-player, cocos2d, unity3d. A More

$1946 USD in 12 days
(12 Reviews)

Hi, thanks for your job posting. I’v good skill on iOS app developing with 6 years XP. ESPECIALLY, I MADE ALREADY VERY SIMILAR SAMPLE APP BEFORE. Please check my portfolio and touch me. I am ready to start and w More

$1288 USD in 9 days
(7 Reviews)

A proposal has not yet been provided

$1159 USD in 20 days
(3 Reviews)

Hello! I have 5 years experience of DSP for telecommunications and great framework (soft & hard) to realise your project. I have my own (developed by me) optimized algorithms of FFT and FEC RS,CRC that are realized in More

$1000 USD in 14 days
(1 Review)

We gone through with requirement and understood that. We have done similar Project in past. WE HAVE GOOD REVIEW AND RATING IN FREELANCER.COM If you want to see the DEMO then contact me ASAP. iPhone Portfo More

$757 USD in 5 days
(1 Review)

Thanks in advance for your time spending on my case! I like doing this job because it's nice & can give me so many opportunities to assist people in business & also gain more experience on language and culture as well. More

$1250 USD in 20 days
(0 Reviews)

A proposal has not yet been provided

$1388 USD in 20 days
(0 Reviews)

Hello Respected Client, We have Read your requirements and we have huge experience in this concept. We are the best company for mobile ,web and Game development. We can provide you a excellent solution as we are pr More

$2000 USD in 35 days
(0 Reviews)

Hi, I am a Telecommunication Engineer with 12-year experience in the development and simulation of algorithms, signal processing and HW/SW architectures for wireless 3GPP CDMA receivers. I have a lot of experience in More

$2222 USD in 30 days
(0 Reviews)