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WaveWarp 2.0 Component

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Functional Description | Algorithm | Signal Implementations | Related Components | Example DWBs usage

Dynamic Range Controllers:

Audio noise gate

Functional Description
 Eliminates the signal if its rms amplitude falls below a specified threshold. A delay buffer is incorporated to give the noise-gate a "look-ahead" capability, improving its effectiveness in some situations.

The behaviour of the noise-gate can be adjusted via its Parameter Window as summarised in the following table.

Parameter Purpose
"Threshold" slider Sets the noise-gate threshold. The purpose of the noise-gate is to eliminate all signals with an rms level which is below this threshold.
"Averaging" slider Sets the averaging time for the mean-square level measurement.
"Attack" slider Sets the Attack Time for the noise-gate's gain smoother.
"Release" slider Sets the Release Time for the noise-gate's gain smoother.
"Delay" slider Sets the delay length for the "look-ahead" buffer.
"Output Gain" slider Adjusts the amplitude of the output signal, after the noise-gate has been applied.

Algorithm
The noise-gate is implemented by measuring the mean-square level of the audio signal and applying an automatic gain control to a delayed version of the raw signal, where the gain is based on the relative values of the mean-square measurement and the specified threshold. The noise-gate is the extreme case of an expander (i.e. with infinite expansion ratio). See [Zo] chapter 7 for a detailed explanation.
Signal Implementations
Audio signals Control signals Description
Single input single output mono-mono n/a The dynamic range of the mono input is modified, and sent to the mono output.
Single input single output mono-stereo n/a The dynamic range of the mono input is modified, and sent (in duplicate) to the two stereo output channels.
Single input single output stereo-mono n/a The dynamic range of each input channel is modified based on a level measurement averaged over the two input channels. The modified signals are then averaged and sent to the mono output.
Single input single output stereo-stereo n/a The dynamic range of each input channel is modified based on a level measurement averaged over the two input channels. The separate modified signals are then sent to the individual stereo outputs.
Related components:
Example DrawingBoards illustrating usage:

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