https://github.com/hitesh24by365/AudioJackTransfer

Transfer data through male-to-male audio jack cable from one android device to another android device
https://github.com/hitesh24by365/AudioJackTransfer

Last synced: about 2 months ago
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Transfer data through male-to-male audio jack cable from one android device to another android device

• Host: GitHub
• URL: https://github.com/hitesh24by365/AudioJackTransfer
• Owner: hitesh24by365
• Created: 2013-03-05T07:15:46.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2015-03-14T10:00:48.000Z (over 9 years ago)
• Last Synced: 2024-07-01T10:51:40.013Z (3 months ago)
• Language: Java
• Homepage: https://hitesh24by365.com
• Size: 561 KB
• Stars: 66
• Watchers: 11
• Forks: 27
• Open Issues: 2
• Metadata Files:
  • Readme: README.md

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README

        
AudioJackTransfer

=================

Transfer data through male-to-male audio jack cable from one android device to another android device.

When you start the application, there are two buttons. First for sender and another for receiver.

The main classes and methods are summarized below:

    SenderActivity: Keep input value, encode that value. 

            encodeMessage: Encodes the message and plays the sound signal using FSK. 

    ReceiverActivity: Start the receiver to receive the sound signal from mic.  The data received is stored in a buffer and then will appear on the screen

    AudioReceiver: Receive the data/message.

            messageReceived: Check the message is received, if not then send last message.

    

FSK Modulation/Demodulation:

  When app starts a thread object that continuously records sound. 

    ArduinoService: sound acquisition

          AudioRecordingRun(): loop that records sound

          write(int): encodes the integer and plays the sound signal.

    FSKDecoder: Thread object that demodulates the sound signal.

    FSKModule: Utility static methods related to FSK modulation/demodulation.

          encode(int): encodes the number into a sound signal

          decodeSound(double): decodes the sound signal into an integer

    ErrorDetection: Before transmission the number(between 0 and 31) is added with a checksum. Then at the reception, the message is decoded and if checksum check:

          fails: an ARQ (Automatic Request Query) code is sent, then the sender repeats the last message sent.

          agrees: an ACK (Acknowledgment) code is sent (if not received the sender tries to the send the last message again).