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[[resources/tools-software/sigmastudiov2/modules/basic|Click here to return to the Arithmetic and Logic page]]
====== RMS Hold ======
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{{:resources:tools-software:sigmastudiov2:modules:basic:rmstchold.png?nolink}}
===== Description =====
The RMS Hold block computes the RMS of the input signals with time constant specified in the text field and holds the maximum value. Hold/Reset the maximum rms value is controlled by the external input pin.
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===== Targets Supported =====
^ Name            ^ ADSP-214xx ^ ADSP-215xx/SC5xx ^ ADAU145x/146x ^
| ------------------------------------------------------------ | -------------------- | -------------------------------- | ---------------------------- |
|RMS Hold | B/S | B/S | NA |
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===== Pins =====
==== Input ====
^Name^Type^Description^
|------------------------------|------------------------------------------------------------|------------------------------|
|Reset|Control|Reset/Hold the maximum rms value|
|Input <fc #ff0000>X</fc>|Audio|Input channel X|
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==== Output ====
^Name^Type^Description^
|------------------------------|------------------------------------------------------------|------------------------------|
|Output <fc #ff0000>X</fc>|Audio|Output channel X|
Note:
     * <fc #ff0000>X</fc> - Channel Index
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===== Configurable Parameters =====
^GUI Parameter Name^Default Value^Range^Function Description^
|------------------------------|---------------------------|----------------------------|----------------------------------------------------------|
|TimeConstant|121|1-8686|Determines how rapidly the RMS value compute with change in input level |
|IsDBps|False|Truie/False|Control value is in dB/s or ms|
|NumChannels|1|20|Number of input and Output channels. Change in this value requires re-compilation|
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===== DSP Parameters =====
^ Parameter Name       ^ Description ^ ADSP-214xx/SC5xx/215xx ^ ADAU145x/146x ^
| ---------------------------------------- | -------------------------------------------------------------------------------- | ---------------------------------------- | ---------------------------- |
|TimeConstant|TC for RMS value compute with change in input level| Float| NA|
|LogCoeff|Constant values| Float| NA|
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===== DSP Parameter Computation =====
TimeConstant = ABS(1-10^(TimeConstant(linear)/(10*FS)))
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Where FS is the Sampling rate
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