Audio Digital Signal Processing (DSP) Module

The audio DSP module enhances the input audio signal sound quality from the ACM. The audio DSP module requires PMI when it is replaced.

The audio DSP module is enabled through software. Additionally, the ACM can mute the audio DSP module through the mute/unmute circuit. If the audio DSP module detects less than 3.5 volts on the mute/unmute circuit, it mutes the speaker output. As a result, an open or short to ground in the mute/unmute circuit causes the audio system to produce no sound, because the enable signal does not reach the audio DSP module.