This version (18 May 2021 08:58) was approved by John Joseph.The Previously approved version (15 Jan 2021 10:56) is available.
Table of Contents
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RMS Compressor
Description
The RMS Compressor block computes the RMS level of the input signal and applies the compressor gain to the input signal based on the RMS value.
Variants
- RMS Compressor
- RMS Compressor with Gain Out
Targets Supported
| Name | ADSP-214xx | ADSP-215xx/SC5xx | ADAU145x/146x |
|---|---|---|---|
| ——————————————————-- | —————————- | ——————————-- | —————————- |
| RMS Compressor | B/S | B/S | S |
| RMS Compressor with Gain Out | NA | NA | S |
Pins
Input
| Name | Type | Description |
|---|---|---|
| ————————————— | —————————— | ———————————————— |
| Input1 | Audio | Input channel1 |
Output
| Name | Type | Description |
|---|---|---|
| ————————————— | —————————— | ———————————————— |
| Output1 | Audio | Output channel1 |
Configurable Parameters
| GUI Parameter Name | Default Value | Range | Function Description |
|---|---|---|---|
| ———————————————- | —————————- | ————————————- | ———————————————————————-- |
| TimeConstant | 121 | 1 to 8686 dB/s | Controls 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. |
| Hold | 0 ms | 0 to 2000 ms | Controls 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/s | Controls the rate at which the compressor gain decreases in response to decrease in the input signal level, e.g. the “Release” time. |
| SoftKnee | False | True/False | Soft-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 |
| Table | All values are 1 | - | Table values are the gain points used to apply for input signal level |
| IsDBps | True | True/False | Enable /Disable the control's Decay and TimeConstant either in dB or linear |
| NumChannels | 1 | 1 to 20 | Number of input and/or output channels. Change in this value requires re-compilation |
DSP Parameters
| Parameter Name | Description | ADSP-214xx/SC5xx/215xx | ADAU145x/146x |
|---|---|---|---|
| —————————— | —————————————— | ——————————————- | ———————————————- |
| TimeConstant | RMS time constant value | Float | 8.24 format |
| Hold | Hold value | Float | 8.24 format |
| Decay | Decay value | Float | 8.24 format |
| Table | Table values | Float | 8.24 format |
| LogCoeff | Constant coefficients | Float | 8.24 format |
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/rmscompressor.txt · Last modified: 12 May 2021 09:36 by John Joseph