Table of Contents
RMS Input Average Compressor
This Module computes the Gain of the Compressor. Compression happens by taking the RMS of the Average of all inputs, and then looking up for the Gain based on the Compressor Graph.
Input Pins
| Name | Format [int/dec] - [control/audio] | Function Description |
|---|---|---|
| Pin 0: Input | decimal - Audio | Audio Input |
Output Pins
| Name | Format [int/dec] - [control/audio] | Function Description |
|---|---|---|
| Pin 0: Output | decimal - Audio | Gain Output |
Grow Algorithm
The module supports Input Channel growth upto a maximum of 6 channels.
Configuration
Compressor graph has a “Point Density” context menu option for varying the resolution of the Points in the compressor graph. 288(0.5db), 720(0.2db) and 1440(0.1db) are the Point densities supported.
| GUI Control Name | Default Value | Range | Function Description |
|---|---|---|---|
| RMSTC | 121 | 1 – 8686 db/s | Determines how rapidly the compressor will respond to input signal level changes |
| Hold | 0 | 0-2000 | Controls the time (in ms) the compressor maintains its current output gain setting before it starts decreasing as the input level decrease. |
| Decay | 10 | 1 - 8686 db/s | Controls the rate at which the compressor gain decreases in response to decrease in the input signal level. |
| Soft-knee | - | - | Soft-knee lets the compressor ease into action, making a less-abrupt change from unprocessed signal to compressed signal. |
| Graph | - | - | Compression Editor Graph. |
DSP Parameter Information
| GUI Control Name | Compiler Name | Function Description |
|---|---|---|
| RMSTC | RmsIPAverageGainBlkAlg1RMS | RMS Time Constant |
| Decay | RmsIPAverageGainBlkAlg1decay | Decay |
| Hold | RmsIPAverageGainBlkAlg1hold | Hold |
| Graph | RmsIPAverageGainBlkAlg1tab | Compressor Graph table values |
Here,
- Green - Algorithm Name
- Red - Instance Number (Changes for each instance)
- Blue - Parameter Name
Algorithm Description
This module computes the Gain of the Compressor. All the inputs to the module are first averaged. RMS value corresponding to the Input Average is computed and converted to dB scale. This value is looked up in the Compressor Graph table to obtain the Gain output value.
Supported ICs
- ADSP215xx
- ADSPSC5xx