Low Volume Alarm Event
The purpose of the Low Volume Alarm event is to warn the user that the volume level of the detected audio is below the level needed for performing meaningful audio analysis. This event is only reported in Non-Referenced Mode.
The system will not start reporting Low Volume Alarm events until a volume level above the “Low Volume Threshold” (see " Low Volume Threshold Example") has been detected. After this condition is satisfied, a Low Volume Alarm event is generated when the detected peak volume drops below the Low Volume thresholds listed below for 10 consecutive 0.5 sec measurement intervals (i.e. 5 sec total). This event will not be repeated until the detected audio volume once again rises above the Low Volume Threshold and then falls below this threshold again for 10 more consecutive 0.5 sec measurement intervals.
- Speech Low Volume Threshold: -15 dBFS
- Music Low Volume Threshold: -20 dBFS
Note that if the volume level for any audio sample exceeds the Low Volume Threshold during any 0.5 sec measurement period, the Low Volume Alarm state machine resets and begins looking again.
The information reported with the Low Volume Alarm event is listed below:
- Info1: Average (RMS) level just prior to alarm event. This is the average level over the last 0.5 sec interval just prior to issuing the alarm.
- Info2: The time at when the system began detecting low volume (i.e. 5 sec before the event was reported)
- Msg: Not used.
