Description

Mycroft wake word plugin for Vosk

Install

pip install ovos-ww-plugin-vosk

Configuration

Quick start

Add the following to your hotwords section in mycroft.conf

  "listener": {
    "wake_word": "hey_computer"
  },
  "hotwords": {
    "hey_computer": {
        "module": "ovos-ww-plugin-vosk",
        "listen": true
    }
  }

replace hey_computer with your wake word and thats all!

a model wil be automatically downloaded for configured language

Single Keyword

Some wake words are hard to trigger, usually if missing from the language model, eg, hey mycroft is usually transcribed as hey microsoft, by default this plugin will check for the wake word name, but the keyword can be configured in a number of ways

• model_folder- full path to a vosk model, optional, will be automatically downloaded
• lang - lang code for model, optional, will use global value if not set. only used to download models
• debug - if true will print extra info, like the transcription contents
• rule - how to process the transcript for detections, see examples below
• time_between_checks - the length in seconds between inferences, must be between 0.2 and 3
• full_vocab - use the full model vocabulary for transcriptions, if false (default) vosk will run in keyword mode
• samples - list of samples to match the rules against, optional, by default uses keyword name

  "listener": {
    "wake_word": "hey_computer"
  },
  "hotwords": {
    "hey_computer": {
        "module": "ovos-ww-plugin-vosk",
        "listen": true,
        "full_vocab": true,
        "rule": "equals",
        "debug": true,
        "samples": ["hey computer", "a computer", "hey computed"],
        "model_folder": "/home/user/Downloads/vosk-model-small-en-us-0.4",
        "time_between_checks": 0.6
    }
  }

Keyword Rules

You can define different rules to trigger a wake word

• contains - if the transcript contains any of provided samples
• equals - if the transcript exactly matches any of provided samples
• starts - if the transcript starts with any of provided samples
• ends - if the transcript ends with any of provided samples
• fuzzy - fuzzy match transcript against samples

TIP: enable debug flag and check logs for what is being transcribed, then finetune the rule and samples

Each wake word must fit in 3 seconds, which is the length of audio the model parses at a time

You can try to improve performance by tweaking time_between_checks, Lower values will decrease performance, higher values will decrease accuracy, default value is 1.0

set full_vocab to transcribe all known words before applying detection rules, by default this is false and the plugin will only look for the wake word samples, depending on wake word this may improve or decrease accuracy

Multiple keywords

A single model per language can be used to check for multiple keywords at once

for example to replace the default wake words

  "hotwords": {
    "hey mycroft": {"active": false},
    "wake up": {"active": false},
    "hey xxx": {
        "module": "ovos-ww-plugin-vosk-multi",
        "listen": true,
        "wakeup": true,
        "keywords": {
           "hey mycroft": {"samples": ["hey mycroft", "hey microsoft", "hey minecraft"], "rule": "fuzzy"},
           "wake up": {"wakeup": true}
        }
    }

you can load any number of languages side by side

  "hotwords": {
    "hey_xxx": {
        "module": "ovos-ww-plugin-vosk-multi",
        "listen": true,
        "full_vocab": false,
        "keywords": {
           "hey mycroft": {"samples": ["hey mycroft", "hey microsoft", "hey minecraft"], "rule": "fuzzy"},
           "hey neon": {},
           "hey computer": {},
           "hey jarvis": {},
           "computador": {"lang": "pt"},
           "jarbas": {"lang": "pt"}
        }
    }