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  • 2017
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  • Quiet – Transmit Data Through Sound

Quiet – Transmit Data Through Sound

November 30, 2017July 27, 2019 Comments Off on Quiet – Transmit Data Through Sound
data over sound javascript data transfer through sound data transmission via sound Quiet - Transmit Data Through Sound quiet js android send data over sound Transmit Data Through Sound

This library uses liquid SDR to transmit data through sound. This makes it suitable for sending data across a 3.5mm headphone jack or via speaker and mic.

Quiet can build standalone binaries for encoding/decoding data via .wav files or for streaming through your soundcard via PortAudio. It can also be built as a library to be consumed by other C programs.

 

Dependencies

  • Liquid DSP Be sure to work from the devel branch
  • libfec (optional but strongly recommended)
  • Jansson
  • libsndfile (optional)
  • PortAudio (optional)

 

Build

With the dependencies installed, run ./bootstrap provided by this library, which will create a build directory and invoke cmake. If you would like to install it after building, do cd build && make install.

 

Profiles

The encoding and decoding processes are controlled by the profiles in quiet-profiles.json. Each profile contains a complete set of parameters such as modem type and error correction.

 

Cable

For cable transmission, use the cable- profiles. These will attempt to use nearly the full spectrum provided by your soundcard. As such, they contain many audible frequencies and should not be used on channels that could be heard by people.

 

Ultrasonic

The ultrasonic- profiles encode data through a very low bitrate, but the audio content lies above 16kHz, which should pass through audio equipment relatively well while being inaudible to the average person. This is a good option for sending data through a channel where you would prefer not to disrupt human listeners.

 

Javascript binding for libquiet

Javascript binding for libquiet allows sending and receiving data via sound card from any browser. It can function either via speaker or cable (e.g., 3.5mm). Quiet comes included with a few transmissions profiles which configure quiet’s transmitter and receiver. For speaker transmission, there is a profile which transmits around the 19kHz range, which is essentially imperceptible to people (nearly ultrasonic). For transmission via cable, quiet.js has profiles which offer speeds of at least 40 kbps.

 

Compatibility

Browser Transmitter Receiver
Chrome Supported Supported
Chrome (Android) Supported Partially Supported
Edge Supported Supported
Firefox Supported Partially Supported
Firefox (Android) Supported Partially Supported
Internet Explorer Not Supported Not Supported
Safari Supported Not Supported
Safari (iOS) Supported Not Supported

 

Usage

Transmit Data Through Sound: Quiet documentation

Quiet-js includes a blob of libquiet compiled by emscripten as well as a javascript binding for ease of use. The bindings must be loaded before the compiled portion. Below is the recommended way to include Quiet in your project.

    <script type="text/javascript" src="quiet.js"></script>
    <script type="text/javascript" src="your_project.js"></script>
    <script async type="text/javascript" src="quiet-emscripten.js"></script>

Additionally, the emscripten compiled portion requires a memory initializer, quiet-emscripten.js.mem. This is loaded asynchronously by quiet-emscripten.js.

It is strongly recommended to also include libfec.js. An emscripten-compiled version of libfec may be found here or with npm install libfec. If libfec is not included, then quiet.js will not be able to use any profiles which use convolutional codes or Reed-Solomon error correction.

 

Source && Download

 

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