Voice activity detection (VAD) is the task of distinguishing human speech segments from background noise in audio stream.

VAD is an important pre-processing stage of an ASR system to decide when to start ASR and when to close the microphone.\nThe models need to be small and efficient so that they can be deployed onto devices. Also, VAD requires low latency.

This VAD tutorial is based on the MatchboxNet model with a modified decoder head to suit classification tasks. MatchboxNet shows the great performance on classifying the segment (utterance-level / second unit) to be speech or non-speech (99.78% F1 score).

A Jupyter Notebook containing all the steps to download the dataset, train a model and evaluate its results is available at: VAD Using Nemo

Model Results

Accuracy: 0.9971

F1 score : 0.9975

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JasperDecoderForClassification-STEP-90800.pt	1.65 KB	February 28, 2025 UTC	curl wget Download
JasperEncoder-STEP-90800.pt	304.62 KB	February 28, 2025 UTC	curl wget Download
trainer-STEP-90800.pt	296.75 KB	February 28, 2025 UTC	curl wget Download