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This version (18 May 2021 08:58) was approved by John Joseph.The Previously approved version (05 Jun 2020 11:43) is available.Diff

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Noise Gate


Description

The NoiseGate block is used to control the volume of an audio signal. Computes the RMS Level of an Incoming Audio Signal and Reduces the Noise which is Below a User-Defined Threshold by Setting the Gain as 0

Targets Supported

Name ADSP-214xx ADSP-215xx/SC5xx ADAU145x/146x
—————————————- —————————- ——————————-- —————————-
NoiseGate B B S


Pins

Input

NameTypeDescription
————————————— —————————— ————————————————
Input0AudioInput channel0

Output

NameTypeDescription
————————————— —————————— ————————————————
Output0AudioOutput channel0


Configurable Parameters

GUI Parameter NameDefault ValueRangeFunction Description
———————————————- —————————- ————————————- —————————————————————-
RMSTC 5 ms 0 to 10000 ms Controls the rate of the RMS-approximation calculation used to track the input level.
Decay 5 ms 0 to 10000 msControls the rate at which the signal compression ratio will subside after the input signal level has dropped below the threshold. Larger values result in longer decays, with 23 never recovering to the original gain
Hold 0 ms 0 to 2000 ms Controls the time to maintain it's current output gain when the input level changes
Threshold1 dB -24 to +24 dBSets the threshold point. If the input signal's approximated RMS level falls below the threshold point, Noise Gate attenuates the signals below the threshold by applying gain as 0.This threshold level does not need to be an integer; its resolution can be set in steps of less than 0.01 dB.
NumChannels120Number of input and output channels. Change in this value requires re-compilation


DSP Parameters

Parameter NameDescriptionADSP-214xx/SC5xx/215xx ADAU145x/146x
—————————— ——————————————————————————- ——————————————- ———————————————-
RMSTCTime constant for RMS calculationFloat 8.24 format
DecayDecay valueFloat 8.24 format
Hold Time to resopond for input level falls below threshold levelFloat 8.24 format
ThresholdthresholdFloat 8.24 format


DSP Parameter Computation

Decay = 1/P^(1000/(Decay * FS))
Hold = FS * HOld/1000
Where P is 1/9 and FS is the sampling rate


Where FS is the sampling rate

resources/tools-software/sigmastudiov2/modules/dynamicsprocessors/noisegate.txt · Last modified: 12 May 2021 09:35 by John Joseph