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Unexpected Level Event
In Referenced Mode, the system knows the Reference Audio file that is being played on the Source DUT; therefore, the system knows which amplitude level to expect at a given time. The Unexpected Level event is reported when the measured level at the start of a tone segment is not within tolerance. The tolerance is dependent on sample rate and bits per sample, but it generally is +/- 3 dB for speech and +/11 dB for music.
Since the exact transmitted amplitude levels from the Source DUT depend on a number automatic and manual analog and digital gain settings, the measured levels are normalized before comparing against limits. See "Audio Volume/Level Calibration".
The information reported with the Unexpected Level event is listed below:
- Info1: The measured normalized level (dB).
- Info2: The expected level (dB).
- Msg: A string containing the “Normalization Gain” factor (dB).