How to implement DBPSK?

I want to develop a kind of data transfer via ultrasound (min 20.000Hz) like Chrip or quiet.js for example.

I use the AudioContext of my browser for both encoding and decoding my data.

enter image description here

Now I want to implement a kind of DBPSK (differential binary phase shift keying) via javascript with the AudioContext to encode my data by phase modulations. I don't really know if my approach is right because I'm not really happy about the testing result in Audacity. I really hope that someone can help me.

let context = new AudioContext();



let wave = (data) => {

  let source = context.createBufferSource();

  let frequency = 19000

  let duration = context.sampleRate*data.length

  

  let buffer = context.createBuffer(1, duration, context.sampleRate);

  let bufferData = buffer.getChannelData(0);

  for (let i = 0; i < context.sampleRate/data.length; i++) {

    let angle = 2 * Math.PI * frequency * i / (context.sampleRate / data.length)

    let bit = data[Math.round(i*(data.length / context.sampleRate) * data.length)]

    bufferData[i] = bit ? Math.sin(angle) : Math.cos(angle);

  }

  source.buffer = buffer;

  return source;

}



let source = wave([1,0,0,0,1,1,1,1])

source.connect(context.destination);

source.start()

Thanks in advance, Jonas

edited Jan 6 at 20:57

asked Jan 2 at 20:05

jonas00

9261621

add a comment |

I want to develop a kind of data transfer via ultrasound (min 20.000Hz) like Chrip or quiet.js for example.

I use the AudioContext of my browser for both encoding and decoding my data.

enter image description here

let context = new AudioContext();



let wave = (data) => {

  let source = context.createBufferSource();

  let frequency = 19000

  let duration = context.sampleRate*data.length

  

  let buffer = context.createBuffer(1, duration, context.sampleRate);

  let bufferData = buffer.getChannelData(0);

  for (let i = 0; i < context.sampleRate/data.length; i++) {

    let angle = 2 * Math.PI * frequency * i / (context.sampleRate / data.length)

    let bit = data[Math.round(i*(data.length / context.sampleRate) * data.length)]

    bufferData[i] = bit ? Math.sin(angle) : Math.cos(angle);

  }

  source.buffer = buffer;

  return source;

}



let source = wave([1,0,0,0,1,1,1,1])

source.connect(context.destination);

source.start()

Thanks in advance, Jonas

edited Jan 6 at 20:57

asked Jan 2 at 20:05

jonas00

9261621

add a comment |

I want to develop a kind of data transfer via ultrasound (min 20.000Hz) like Chrip or quiet.js for example.

I use the AudioContext of my browser for both encoding and decoding my data.

enter image description here

let context = new AudioContext();



let wave = (data) => {

  let source = context.createBufferSource();

  let frequency = 19000

  let duration = context.sampleRate*data.length

  

  let buffer = context.createBuffer(1, duration, context.sampleRate);

  let bufferData = buffer.getChannelData(0);

  for (let i = 0; i < context.sampleRate/data.length; i++) {

    let angle = 2 * Math.PI * frequency * i / (context.sampleRate / data.length)

    let bit = data[Math.round(i*(data.length / context.sampleRate) * data.length)]

    bufferData[i] = bit ? Math.sin(angle) : Math.cos(angle);

  }

  source.buffer = buffer;

  return source;

}



let source = wave([1,0,0,0,1,1,1,1])

source.connect(context.destination);

source.start()

Thanks in advance, Jonas

edited Jan 6 at 20:57

asked Jan 2 at 20:05

jonas00

9261621

I want to develop a kind of data transfer via ultrasound (min 20.000Hz) like Chrip or quiet.js for example.

I use the AudioContext of my browser for both encoding and decoding my data.

enter image description here

let context = new AudioContext();



let wave = (data) => {

  let source = context.createBufferSource();

  let frequency = 19000

  let duration = context.sampleRate*data.length

  

  let buffer = context.createBuffer(1, duration, context.sampleRate);

  let bufferData = buffer.getChannelData(0);

  for (let i = 0; i < context.sampleRate/data.length; i++) {

    let angle = 2 * Math.PI * frequency * i / (context.sampleRate / data.length)

    let bit = data[Math.round(i*(data.length / context.sampleRate) * data.length)]

    bufferData[i] = bit ? Math.sin(angle) : Math.cos(angle);

  }

  source.buffer = buffer;

  return source;

}



let source = wave([1,0,0,0,1,1,1,1])

source.connect(context.destination);

source.start()

Thanks in advance, Jonas

let context = new AudioContext();



let wave = (data) => {

  let source = context.createBufferSource();

  let frequency = 19000

  let duration = context.sampleRate*data.length

  

  let buffer = context.createBuffer(1, duration, context.sampleRate);

  let bufferData = buffer.getChannelData(0);

  for (let i = 0; i < context.sampleRate/data.length; i++) {

    let angle = 2 * Math.PI * frequency * i / (context.sampleRate / data.length)

    let bit = data[Math.round(i*(data.length / context.sampleRate) * data.length)]

    bufferData[i] = bit ? Math.sin(angle) : Math.cos(angle);

  }

  source.buffer = buffer;

  return source;

}



let source = wave([1,0,0,0,1,1,1,1])

source.connect(context.destination);

source.start()

let context = new AudioContext();



let wave = (data) => {

  let source = context.createBufferSource();

  let frequency = 19000

  let duration = context.sampleRate*data.length

  

  let buffer = context.createBuffer(1, duration, context.sampleRate);

  let bufferData = buffer.getChannelData(0);

  for (let i = 0; i < context.sampleRate/data.length; i++) {

    let angle = 2 * Math.PI * frequency * i / (context.sampleRate / data.length)

    let bit = data[Math.round(i*(data.length / context.sampleRate) * data.length)]

    bufferData[i] = bit ? Math.sin(angle) : Math.cos(angle);

  }

  source.buffer = buffer;

  return source;

}



let source = wave([1,0,0,0,1,1,1,1])

source.connect(context.destination);

source.start()

javascript audio audiocontext

edited Jan 6 at 20:57

asked Jan 2 at 20:05

jonas00

9261621

edited Jan 6 at 20:57

asked Jan 2 at 20:05

jonas00

9261621

edited Jan 6 at 20:57

asked Jan 2 at 20:05

jonas00

9261621

asked Jan 2 at 20:05

jonas00

9261621

asked Jan 2 at 20:05

jonas00

9261621

add a comment |

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