hotwordwrap

Hotword detector wrapper

Now you can use sox or arecord in linux based systems Written in Node.js using latest Snowboy version by Kitt.ai. Snowboy is an offline neural network driven hotword detection library, with compatibility only on MacOS (darwin) and most Linux distro's. This module aims to simplify and improve the standard snowboy module by turning it into one single interface with build-in microphone recording and by adding start, stop, pause, and resume functionality.

Installation

npm i --save hotwordwrapper

Dependencies

This module uses snowboy, therefore it requires a some resources before hand please see the official website for these resources.

The module also uses the node-audiorecorder module. It requires you to have SoX installed and it must be available in your $PATH. For more information see the node-audiorecorder module.

Usage

Constructor

// Import module.
const HotwordDetector = require('hotwordwrapper');

// Detector data.
// See the 'snowboy' module for more information.
const detectorData = {
  resource: './node_modules/snowboy/resources/common.res'
};
// Array of data for each hotword model.
// See the 'snowboy' module for more information.
const modelData = [
  {
    file: './node_modules/snowboy/resources/snowboy.umdl',
    hotwords : 'snowboy',
    sensitivity: '0.5'
  }
];
// Optional parameter to select the recording options.
/*
options - JSON containing command line options. Following are valid options:
endian: big OR little, default: little
bitwidth: 8 OR 16 OR 24 OR anything valid supported by arecord OR sox, default: 16
encoding: signed-integer OR unsinged-integer (none of the other encoding formats are supported), default:signed-integer
rate: 8000 OR 16000 OR 44100 OR anything valid supported by arecord OR sox, default: 16000
channels: 1 OR 2 OR anything valid supported by arecord OR sox, default: 1 (mono)
device: hw:0,0 OR plughw:1, 0 OR anything valid supported by arecord. Ignored for sox on macOS.
debug: true OR false - can be used to aide in debugging
fileType: string defaults to 'raw', allows you to set a valid file type such as 'wav' (for sox only) to avoid the no header issue mentioned above, see a list of types here
*/
const recorderData = {
  rate: '16000',
    channels: '1',
    debug: true,
};
// Optional parameter intended for debugging.
// The object has to implement a log and warn function.
const logger = console;

// Create an instance.
let hotwordDetector = new HotwordDetector(detectorData, modelData, recorderData, logger);

More information about mic.

Methods

// Creates the detector and starts the recording process.
hotwordDetector.Start();
// Stops the detection process and removes the recording process.
hotwordDetector.Stop();

Events

// Triggered when an error is encountered.
hotwordDetector.on('error', function(error) {
  console.error('hotwordDetector: ' + error);
});
// Triggered when a hotword has been detected.
hotwordDetector.on('hotword', function(index, hotword, buffer) {
  // Index is the associated index of the detected hotword.
  // Hotword is a string of which word has been detected.
  // Buffer is the most recent section from the audio buffer.
  console.log('hotwordDetector: Hotword detected: ' + hotword);
});
// Triggered when there is no audible sound being recorded.
hotwordDetector.on('silence', function() {
  console.log('hotwordDetector: silence');
});
// Triggered when there is audible sound being recorded.
hotwordDetector.on('sound', function(buffer) {
  // Buffer is the most recent section from the audio buffer.
  console.log('hotwordDetector: sound: ' + buffer);
});