System Description: Overview

The Audio Unit acts as the "processor" for all audio and video signals (RES). Selection of the audio functions can be done from the front panel, the audio remote (on the steering wheel), or by using the navigation voice control system. The audio display provides the current front and rear audio status. For vehicles with the navigation option, additional audio information is available by touching the audio button. (See the owner's manual for more details)

Each audio component passes its audio or video signal to the audio. In addition, it communicates with the audio unit via the GA-Net bus. Any open connection in this circuit will cause the audio, and the navigation functions to appear inoperative.

The system includes an active noise control system to cancel some of the vehicle noise (2WD). It uses a sine wave-shaped sound output to cancel noise developed during the cylinder cancel operation. This occurs in the 1,500-2,400 RPM range. Two microphones detect the low frequency sound, and the system outputs a canceling sound through the audio speakers.

Fig 1: Identifying Waveform

Courtesy of AMERICAN HONDA MOTOR CO., INC.

The XM can output to either the front or the rear RES. However, if XM is playing in the front, the CD changer can be used for the RES. The RES (DVD player) can be used to play a CD in the rear.

A Security signal is daisy-chained between the audio, RES and navigation components for integration into the vehicle's alarm system.

The RES consists of a DVD player, a rear controller/screen, and an auxiliary jack assembly.

The optional navigation system provides voice control audio, XM, and CD player. Voice control commands communicated on the GA-Net (audio unit). When using the talk/back button, the audio is muted on all speakers (but not the RES headphones), and you get navigation sound on the front channels. When using the navigation or route guidance (RG), the front speakers give the navigation sound. Muting commands are passed on the GA-Net bus. For more information, see the NAVIGATION SYSTEM article. The outline of the interruption function is shown in INTERRUPTION FUNCTION REFERENCE TABLE .