DACMC - HEV

The DACMC  is a digital signal processor that consists of an internal analog/digital converter, amplifier, and tone generator.

The DACMC  operates with the ignition in RUN, ACC, or OFF. Active noise control functions only operate with the ignition in RUN.

The ACM  outputs voltage through the enable circuit to enable the DACMC  amplifier. The ACM  also uses this circuit to detect an amplifier overload condition. In the event of an amplifier overload, the DACMC  modifies the voltage signal from the ACM  to increase the voltage on the enable circuit to a higher level than provided by the ACM  . This higher voltage level causes the ACM  to momentarily reduce the audio levels on the left and right audio output channels to the DACMC  to prevent clipping and speaker damage.

The DACMC  receives engine rotation speed data and active noise control microphone input signals and calculates the targeted frequency needed to cancel engine noise within the passenger compartment. The DACMC  outputs the engine noise cancellation frequency to all audio system speakers, except the instrument panel center speaker (if equipped), as fluctuating AC voltage.

The DACMC  receives audio signals from the ACM  when audio is being played. The DACMC  amplifies these signals and sends them to the door speakers as fluctuating AC voltage. If the engine is running and the audio system is in use, the DACMC  mixes the engine noise cancellation frequency signal with the audio signals from the ACM  . The mixed audio signals are then sent to all of the speakers, except the instrument panel center speaker (if equipped), as fluctuating AC  voltage.

For vehicles with active noise control, ACM  provides the audio signals to the subwoofer amplifier, the instrument panel speaker and the DACMC  . The DACMC  processes the audio signals with the noise cancellation signals and provides the door speakers with the amplified audio signals.

The DACMC  requires Programmable Module Installation (PMI) when it is replaced.