VNC+ Variant SFD (VNC ALA CAO with noise Estimator)
VNC Variant SFD (Without Noise Estimator)
The reference signal flow demonstrates the VNC-ALA feature in a simplified setup. The Upmixing, Channel Routing, and System Tuning sections are only very basic placeholder implementations for the purpose of demonstration. The VNC-ALA feature consist of the three main components: ALA CAO, VNC CAO, and Noise Estimator (NoiseEst). These three components are placed at different locations in the audio pipeline and may even be distributed to separate cores.
The ALA CAO includes the ALA related audio objects and is typically placed at the beginning of the audio pipeline. ALA is affecting the Entertainment (or Background) audio signals.
The VNC CAO combines the VNC related audio objects and is typically placed after the upmixing section. The VNC is affecting the upmixed Entertainment (or Background) signals and the Announcement (or Foreground) audio signals.
The Noise Estimator requires as input signals a microphone signal, picking up the cabin noise, and the woofer loudspeaker signals, taken from the very end of the audio pipeline. Please note Noise Estimator is not used in VNC variant of project.
The VNC-ALA reference signal flow has 6 input channels:
- Entertainment channel 1 (Stereo Left)
- Entertainment channel 2 (Stereo Right)
- Announcement channel 1 (Mono)
- Announcement channel 2 (Mono)
- Announcement channel 3 (Mono)
- Mic
There are 8 output channels:
- Tweater channel 1 (Front Left)
- Woofer channel 1 (Front Left)
- Tweater channel 2 (Front Right)
- Woofer channel 2 (Front Right)
- Tweater channel 3 (Rear Left)
- Woofer channel 3 (Rear Left)
- Tweater channel 4 (Rear Right)
- Woofer channel 4 (Rear Right)
The reference signal flow receives 7 control signals:
- Vehicle Speed
- Fan Speed
- Roof State
- Mute
- HU Vol
- Gal Vol
- Ann Vol