Theory of Operation
The Engine Sound Enhancement Module (ESEM) / (ANC) transmits a tuning sound through the Center I/P Speaker, to reproduce the engine sound in the passenger compartment. The synthesized sound uses engine noise, vehicle speed, engine torque and accelerator position to reproduce the most correct sound in the passenger compartment to enhance the driving experience. The sound is processed according to the driving mode selector position. The system consists of a Shaker Microphone, the ESEM and the Center I/P Speaker.
The Shaker Microphone is a magnetic-dynamic transducer located on the engine intake manifold. It picks up intake air vibrations and translates them into electric pulses, which are sent to the ESEM.
The ESEM receives data from the microphone; then processes, amplifies, and sends the audio signal to the Center I/P Speaker. The ESEM also receives information about engine load, engine rpm and vehicle speed from the BCM. The sound is projected by the speaker located in the center of the dashboard. The ESEM receives power from the rear PDC.
The Center I/P Speaker is connected to the ESEM instead of the amplifier. There are two types of speakers for the ESEM: basic and top sound system level. The Center I/P Speaker is present in both sound systems and is used for the ESEM only, regardless of the sound system level (basic or top)
