This version is outdated by a newer approved version.DiffThis version (10 Feb 2021 13:06) was approved by Sanjeeva Reddy.

This is an old revision of the document!

Click here to return to the Dynamic Processors page

RMS w/Ext Detector


The RMS w/Ext Detector Compressor block computes the RMS level of the control signal and applies the compressor gain to the input signal based on the RMS value.

Targets Supported

RMS w/Ext Detector Yes YesYes Yes



ExtDetectorInputControlDetermines the amount of compressor gain applied to the input signal
Input1AudioInput channel1


Output1AudioOutput channel1

Configurable Parameters

GUI Parameter NameDefault ValueRangeFunction Description
TimeConstant121 1 to 8686 dB/sControls the time constant (TC) in dB/second that is used for calculating the RMS input value. The time constant determines how rapidly the compressor will respond to input signal level changes, e.g. the “Attack” time.
Hold0 ms0 to 2000 msControls the time (in ms) the compressor maintains its current output gain setting before it starts decreasing as the input level decrease.
Decay 10 dB/s 0 to 10000 dB/sControls the rate at which the compressor gain decreases in response to decrease in the input signal level, e.g. the “Release” time.
SoftKneeFalseTrue/FalseSoft-knee lets the compressor ease into action, making a less-abrupt change from unprocessed signal to compressed signal. If it is not activated, the default is hard-knee behavior, in which compression rate reduces or increases abruptly with the threshold level.
TableAll values are 1-Table values are the gain points used to apply for input signal level
IsDBpsTrueTrue/False Enable /Disable the control's Decay and TimeConstant either in dB or linear
NumChannels11 to 20Number of input and output channels. Change in this value requires re-compilation

DSP Parameters

Parameter NameDescriptionADSP-214xx/SC5xx/215xx
TimeConstantRMS time constant valueFloat
HoldHold valueFloat
DecayDecay valueFloat
TableTable values Float
LogCoeff Constant coefficientsFloat

DSP Parameter Computation

TimeConstant = Abs(1 - 10^(TimeConstant/(10 * (FS + 0.0000001)))), Where TimeConstant is 20000/TimeConstant in dBps
Decay = (20000/Decay)/(FS + 0.0000001) (When Decay is in dBps) or Decay/(FS + 0.0000001) (When Decay is in linear)
Hold = FS * Hold/1000
Where FS is the sampling rate

resources/tools-software/sigmastudiov2/modules/dynamicsprocessors/rmswithexternalinput.1610704837.txt.gz · Last modified: 15 Jan 2021 11:00 by Nikhin Shetty