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Amplitude Fluctuation Event
The Amplitude Fluctuation event (i.e. amplitude modulation) is reported if while in Referenced Mode, the system detects unexpected amplitude changes over a given interval. The test tones in Frontline’s Reference Audio files have a fixed amplitude level over their duration. Therefore, if the corresponding audio levels received over the air by the system fluctuates more than a specified level (this level is based on the received audio stream parameters), then the system generates an Amplitude Fluctuations event.
The system calculates amplitude fluctuations as:
The information reported with the Amplitude Fluctuations event is listed below:
- Info1: Percent Amplitude Modulation, expressed as an integer; e.g., “40” = 40%.
- Info2: Not used.
- Msg: Not used.