This version (18 May 2021 08:59) was approved by John Joseph.The Previously approved version (08 Feb 2021 05:40) is available.
Table of Contents
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AGC Core
Description
This Module is the gain computation part of a compressor. Compression happens by taking the RMS of i/p samples i.e. by passing the input samples through a low-pass filter, converting this to dB scale and then looking up the corresponding gain value. There is a threshold set as a parameter in the Module, below which compression occurs.
Targets Supported
| Name | ADSP-214xx | ADSP-215xx/SC5xx | ADAU145x/146x |
|---|---|---|---|
| ——————————————————-- | —————————- | ——————————-- | —————————- |
| AGC Core | B | B | NA |
Pins
Input
| Name | Type | Description |
|---|---|---|
| ————————————— | —————————— | ———————————————— |
| Input | Audio | Input channel |
Output
| Name | Type | Description |
|---|---|---|
| ————————————— | —————————— | ———————————————— |
| Output | Control | Compressor Gain |
Configurable Parameters
| GUI Parameter Name | Default Value | Range | Function Description |
|---|---|---|---|
| ———————————————- | —————————- | ————————————- | —————————————————————- |
| Decay | 20ms | 20 to 100ms | Decay coefficient of the compressor |
| Attack time | 20ms | 20 to 100ms | Attack coefficient of the compressor |
| Ratio | 1 | 1 to 100 | The ratio is ratio of the gain reduction below the threshold |
| Gain | 0dB | -120 to 20dB | The make-up gain of the compressor, in dB |
| Threshold | 0dB | -80 to 20dB | The compression threshold, in dB, below which compression takes place |
DSP Parameters
| Parameter Name | Description | ADSP-214xx/SC5xx/215xx |
|---|---|---|
| —————————— | ——————————————————————————————————-- | ——————————————- |
| DecayCoeff | Decay coefficient of the compressor | Float |
| SmoothDecay | Decay smooth coefficient of the compressor | Float |
| AttackCoeff | Attack coefficient of the compressor | Float |
| SmoothAttack | Attack smooth coefficient of the compressor | Float |
| Slope | The ratio is ratio of the gain reduction below the threshold | Float |
| Gain | The make-up gain of the compressor, in dB | Float |
| Threshold | The compression threshold, in dB, below which compression takes place | Float |
DSP Parameter Computation
Hold = (int) FS * Hold/1000
Decay = 1/10^(Decay * 2/(10 * (FS + 0.000001)))
Where FS is the sampling rate
resources/tools-software/sigmastudiov2/modules/dynamicsprocessors/agccore.txt · Last modified: 12 May 2021 09:37 by John Joseph