The purpose of the ALA Control audio object is to calculate the Gain Factor by using control inputs: MNR (Music to Noise Ratio), vehicle speed and entertainment volume. These are the factors used to compute Compander parameters (Compressor Ratio, Threshold, Extra Gain and After Gain) used in the VNC ALA CAO.
The object has no audio inputs and only four control inputs and outputs.
This module uses the following control inputs and outputs:
Tuning Parameters
| Parameter | Min | Max | Default | Description |
| Mode | 0 | 2 | 1 | Mode of operation
|
| VolumeRange | 0.0 | 1.0 | 0.1 | Volume range |
| CompanderThreshold | -140.0 | 0.0 | 0.0 | Compander threshold: The Compressor starts compressing the signal above this level. |
| companderGainZeroDb | -40.0 | 40.0 | 0.0 | Gain for 0dB |
| companderMinBoost | -20.0 | 20.0 | 0.0 | Minimum boost |
| companderMaxBoost | -20.0 | 20.0 | 0.0 | Maximum boost |
| minLvlDelta | 0.0 | 100.0 | 0.0 | Minimum level delta: Threshold for the level jump criteria. If the entertainment or announcement level delta is larger than this threshold, the algorithm is triggered. |
| minTimeDelta | 0.0 | 100.0 | 0.0 | Minimum time delta: Time threshold that keeps the algorithm to be triggered too often. If a big level jump is present, than we ignore this time delta |
Control Inputs:
| Speed | 0.0 | 300.0 | 0.0 | Control for input speed |
| Entertainment Volume | 0.0 | 200.0 | 0.0 | Control for input Entertainment volume. |
| GAL to User | 0.0 | 200.0 | 0.0 | Control input GAL(Speed dependent volume) to User amount. |
| MNR to User | 0.0 | 100.0 | 0.0 | Control input MNR(Music To Noise Ratio) to User amount. |
Control Outputs:
| Compressor Ratio | 0 | 20 | – | Decide how much signal needs to compressor as compare to input. |
| Threshold | -140.0 | 0.0 | 0.0 | Above this level compressor starts to compress. |
| Extra gain | -20.0 | 20.0 | 0.0 | Control Output Extra gain |
| After gain | -20.0 | 20 | 0.0 | Control Output After gain |
Design Time Parameters:
The AlaControl audio object has one additional configuration variable: Block Control. This configuration variable can be configured during design time.
The default value for “Block Control” additional configuration is disabled (0).
When “Block Control” is enabled (1), the control inputs and control outputs are grouped.
