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An Alesis Micro Gate noise gate. A noise gate or simply gate is an electronic device or software that is used to control the volume of an audio signal.Comparable to a limiter, which attenuates signals above a threshold, such as loud attacks from the start of musical notes, noise gates attenuate signals that register below the threshold. [1]
For example, in live sound reinforcement, a noise gate is often employed to mute or attenuate the microphone signal when the sound level falls below a certain threshold. This helps minimize the pickup of ambient noise and unwanted signals. 3. Radar systems: Signal gating plays a crucial role in radar systems, particularly in pulse-Doppler radar ...
A second mic receives ambient noise. In a noisy environment, both microphones receive noise at a similar level, but the primary mic receives the desired sounds more strongly. Thus if one signal is subtracted from the other (in the simplest sense, by connecting the microphones out of phase) much of the noise is canceled while the desired sound ...
Without a noise gate, the microphone for a specific instrument such as the floor tom will also pick up signals from nearby drums or cymbals. With a noise gate, the threshold of sensitivity for each microphone on the drum kit can be set so that only the direct strike and subsequent decay of the drum will be heard, not the nearby sounds.
A noise gate can be thought of as an extreme form of downward expansion as the noise gate make the quiet sounds (for instance: noise) quieter or even silent, depending on the floor setting. [2] Upward expansion makes the louder sounds above the threshold even louder.
Close mic(s) are used as an external key for the noise gate. Hold time of noise gate is set to half a second or so (this would be a real duration of hit sound), followed by a fast release time. This causes the gate to allow only the first half-second of reverb to pass through after each drum hit, before closing again. close mic and ambience ...
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It usually includes a microphone preamp with a switchable phantom power voltage to power condenser microphones and some form of audio equalization. Some designs also offer other facilities including audio compression, de-essing, noise-gating and limiting.
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