I am Sachin Rai. I am doing my project work for PhD course. In the Project, I require an Android app which is able to transfer text and Image using Audio over two mobile Phone. I need to convert text and image into audio signal and vice [url removed, login to view] required modulation of signal and knowledge of modulation and demodulation technique. the app should be capable of modulation of text over audio signal also breaking of image into bits and transmitting over audio signal. MFSK or Spectrogram technique can be used . any other method is also acceptable.