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[micro_wake_word] Update documentation to discuss how voice activity is detected (#4097)

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Kevin Ahrendt 2024-07-30 22:15:41 -04:00 committed by Jesse Hills
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components/micro_wake_word.rst
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@ -55,7 +55,7 @@ Configuration variables:
- **probability_cutoff** (*Optional*, percentage): The probability cutoff for voice activity detection.
If the probability is below this value, then no wake word will be accepted.
A larger value reduces the number of false accepts but increases the number of false rejections.
- **sliding_window_size** (*Optional*, int): The size of the sliding window for voice activity detection. The maximum of the probabilities in the sliding window is compared to ``probability_cutoff`` to determine if voice activity is detected.
- **sliding_window_size** (*Optional*, int): The size of the sliding window average for voice activity detection. The average probability is compared to ``probability_cutoff`` to determine if voice activity is detected.
The ``probability_cutoff`` and ``sliding_window_size`` are provided by the JSON file but can be overridden in YAML. A default VAD model is provided with the ``vad`` configuration variables, but a different model can be overridden in YAML.