bfsk-speech-synth-stream

A node.js module implementing a readable audio stream that generates Binary FSK (Frequency-shift keying) for testing purposes

Basically, bfsk is treated as language for speech processing where a frequency is specified to indicate 0 and another frequency is specified to indicate 1.

So we can use this module to generate BFSK tones from text. The "voice" parameter is used to specify the duration of the tone in milliseconds

Installation

npm i bfsk-speech-synth-stream

Sample Usage

You will need to have some extra modules installed:

npm i bfsk-speech-recog-stream speaker

Then you can try this code:

const Speaker = require('speaker')

const BfskSpeechSynthStream = require('bfsk-speech-synth-stream')
const BfskSpeechRecogStream = require('bfsk-speech-recog-stream')

const zero_freq = 500
const one_freq = 2000

const sampleRate = 8000

const language = `${zero_freq}:${one_freq}`
const voice = '5' // tone_duration

const audioFormat = 1 // LINEAR16

const signed = true

const format = {
  audioFormat,
  channels: 1,
  sampleRate,
  bitDepth: 16,
  signed,
}

const params = {
  text: 'hello, world',
  language,
  voice,
}

const opts = {
  format,
  params,
}

const ss = new BfskSpeechSynthStream(opts)

const sr = new BfskSpeechRecogStream({
  format,
  params: {
    language,
  }
})

const speaker = new Speaker(format)

sr.on('speech', data => {
  console.log(new Date(), 'speech', JSON.stringify(data, null, 2))
})

ss.pipe(sr)
ss.pipe(speaker)

Output:

2024-06-11T00:21:27.914Z speech {
  "transcript": "hello, world",
  "raw": "011010000110010101101100011011000110111100101100001000000111011101101111011100100110110001100100"
}