SLASEG6B May 2018 – June 2020 TAS3251
The Automatic Gain Limiter (AGL) is a feedback mechanism that can be used to automatically control the audio signal amplitude or dynamic range within specified limits. The automatic gain limiting is done by sensing the audio signal level using an alpha filter energy structure shown in Figure 51 at the output of the AGL then adjusting the gain based on the whether the signal level is above or below the defined threshold. Three decisions made by the AGL are engage, disengage, or do nothing. The rate at which the AGL engages or disengages depends on the attack and release settings, respectively.