This version (30 Jul 2012 23:17) was approved by Brett Gildersleeve.
Growable Single Volume Control
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| The Growable Single Vol Ctrl (or “Growable Single Volume Control”) algorithm applies gain to an input signal. The gain is updated using an RC-type slew curve. The number of input channels is scalable - each input is routed to a corresponding output pin. The same gain is applied to all input channels simultaneously. |  |
Input Pins
| Name | Format [int/dec] - [control/audio] | Function Description |
|---|---|---|
| Pin 0: Audio Input | decimal - audio | Audio Input - Channel 0 |
Output Pins
| Name | Format [int/dec] - [control/audio] | Function Description |
|---|---|---|
| Pin 0: Audio Output | decimal - audio | Audio Output - Channel 0 |
GUI Controls
| GUI Control Name | Default Value | Range | Function Description |
|---|---|---|---|
| Volume Slider (dB) | 0 | -144 to +24 | Controls the target level for the output gain |
DSP Parameter Information
| GUI Control Name | Compiler Name | Function Description |
|---|---|---|
| Volume Control Slider | GainS200AlgGrowDP1gain_target | Target value for the output gain. |
| N/A | GainS200AlgGrowDP1alpha | Rate at which the output gain slews to the target value. The alpha and 1-alpha values are stored in consecutive memory locations. Note: This parameter is stored in non-modulo data RAM. |
Algorithm Description
The Growable Single Volume Control applies gain to any number of input signals. It is implemented using a slew curve approximating an RC curve. The same instantaneous gain value is applied to all input signals simultaneously.
This plot shows the response of an input signal when the gain is changed from zero (linear) to one (full scale, linear):
This plot shows the response of an input signal when the gain is changed from one (full scale, linear) to zero (linear):
Example
This example shows 4 digital audio channels being processed by a Growable Single Volume Control cell. When the slider is moved, the gain of all 4 channels will be uniformly changed, following an RC slew curve.
Algorithm Details
| Toolbox Path | Volume Controls - Adjustable Gain - Single/Multiple Controls - Clickless SW Slew - Growable Single Vol Ctrl |
| Cores Supported | ADAU144x ADAU1761 ADAU1781 |
| “Grow Algorithm” Supported | yes - see Algorithm Growth Information |
| “Add Algorithm” Supported | yes - see Algorithm Addition Information |
| Subroutine/Loop Based | no |
| Program RAM | 7* |
| Data RAM | 3* |
| Parameter RAM | 3* |
*Numbers are based on one instance of the algorithm with no additional “add” or “grow”
Algorithm Growth Information
| Description | An extra channel is added. The application of gain to each channel is done with the same calculation. |
| Program RAM Repetition | 2 per growth |
| Data RAM Repetition | 1 per growth |
| Parameter RAM Repetition | none |
Algorithm Addition Information
| Description | An extra channel is added. The gain calculation is done separately for each channel, so the program, data, and parameter RAM requirements double. |
| Program RAM Repetition | 7 per add |
| Data RAM Repetition | 3 per add |
| Parameter RAM Repetition | 3 per add |
resources/tools-software/sigmastudio/toolbox/volumecontrols/growablesinglevolumecontrol.txt · Last modified: 30 Jul 2012 23:17 by Brett Gildersleeve