Stereo Amplifier: Notes
The stereo amplifier is a separated power amplifier interface. Digital audio signal (SPDIF2) that is received from the audio unit is processed on the DSP, and sent to each speaker after amplified by the AMP IC.
The stereo amplifier communicates with the audio unit using the dedicated serial bus (RS485). This communication includes the vehicle speed (for SVC) information, audio settings, and the MUTE commands. The stereo amplifier adjusts the speaker outputs by oneself which is based on the received information.
The stereo amplifier receives the noise cancelling signal (ANC), guidance signal, and system beep signal via independent lines, and mixes them to the applicable audio lines.