This version (18 May 2021 08:43) was approved by John Joseph.The Previously approved version (18 Mar 2021 15:39) is available.Diff

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Adaptive Mixer Dual Graph


The Adaptive Mixer Dual (graph) is an advanced method of mixing two signals based on a third control signal.


The orange pin here indicates that the input control signal will be converted to a RMS average value, eliminating the need to use the RMS table for this application. The RMS table value is used to determine the scale factors for the signals to be mixed. Users can select and change the curves for both signals to be mixed.|

Targets Supported

Name ADSP-214xx ADSP-215xx/SC5xx ADAU145x/146x
—————————————— ——————-- ——————————-- —————————-
Adaptive Mixer Dual Graph NA NA S



Name Type Description
———————- ————-- ———————-
Input0 Audio Audio input
Input1 Audio Audio input
Selector Control Calculates the RMS average for this input signal


Name Type Description
———————- ————-- ———————-
Output0 Audio Compressed mono audio output

Configurable Parameters

GUI Parameter Default Value Range Function Description
—————————————- ———————- —————— —————————————-
TimeConstant 150 1 - 1000 Controls the Time Constant (TC) setting the attack time of the RMS average computation. The RMS time constant determines how rapidly the gain will adapt to abrupt changes in the input signal level
Step 8 1 to 23 Controls the slew ram rate in terms of how quickly the algorithm ramps to the next value
Smooth False True/False This checkbox determines whether the ratio curve of the levels will be exactly linear from graph point to graph point, or if it will be smoothed out
Show Graph This button allows you to bring up the mix ratio window. You can change the curve by moving, adding, or removing graph points. The RMS table value gives you the x-value on this graph and the corresponding y-values will be the scale factors for the output levels of the mix between the 1st and 2nd pins
TableMixer1 Table corresponding to first graph
TableMixer2 Table corresponding to second graph

DSP Parameters

Parameter Name Description ADAU145x/146x
—————————————- ——————————————————————————-- —————————-
tc Time constant FixPoint8d24
step step size FixPoint8d24
points_ONE First graph FixPoint8d24
points_TWO Second graph FixPoint8d24

DSP Parameter Computation

step = 2 ^ (-1 / Step) tc = (10 ^ (TimeConstant / (10 * FS))) - 1

resources/tools-software/sigmastudiov2/modules/advanceddsp/adaptivemixer.txt · Last modified: 12 May 2021 13:22 by John Joseph