When the gate is closed, the output is suppressed to remove the noise when the gate is open, the input goes to the output unchanged. It would notice when audio went either above or below the threshold, and “open” or “close” the gate correspondingly. It doesn’t remove the noise from under the speech-that’s called noise reduction-but it removes the noise between the phrases.īack when audio processing was analog and real-time, the noise gate had to be simple. It detects the parts of the audio signal with very low volume, where nothing is happening apart from the background noise, and either reduces the volume further or silences it completely.
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