Referenced Mode Event Reporting

In Referenced Mode, the system operates in a “pseudo closed loop” test scenario where the user plays specific Reference Audio files (pre-recorded audio test files provided by Frontline) on the Source DUT (Device Under Test). See "Referenced Mode Processing" for a more complete description. The events listed in the following sections are reported when the system is operating in Referenced Mode.

The following events are reported whenever the system is operating in Reference mode.

1. Test ID Found Event [Information]: Reported when a valid Test ID has been recognized.
2. Test Script Not Found Event [Error]: Reported when a valid Test ID was found but the system cannot locate the script for that Test ID.
3. Invalid Test Script Event [Error]: Reported when an error occurs while the system is verifying information in a test script.
4. Synchronization Lost Event [Error]: Reported when the system is in Referenced Mode and encounters unexpected frequencies or durations of audio segments while analyzing a received Reference Audio file.
5. Unexpected Frequency Event [Error]: Reported when a measured frequency deviates from an expected frequency by a specific percentage.
6. Unexpected Level Event [Error]: Reported when the measured level at the start of a tone segment is not within tolerance.
7. Unexpected Duration Event [Error]: Reported when a tone segment of the Reference Audio file is shorter or longer than expected.
8. Amplitude Fluctuations Event [Warning]: Reported if the system detects unexpected amplitude changes over a given interval.
9. Clipping Event [Error]: Reported when consecutive samples at the maximum value that can be represented by the digital system have been detected.
10. Unexpected Phase Change Event [Error]: Reported if the system detects a phase change during programmed intervals of constant frequency.
11. Excess Noise Event [Error]: Reported when energy sufficiently above the “Silence Threshold” is detected during programmed segments of silence.
12. CVSD HF Level Too High Event [Error]: Reported when a CVSD encoded audio stream is detected and there is high frequency energy above 4 kHz that is greater than -20 dBFS.
13. End of Test Event [Information]: Reported to indicate that the system has completed processing a test script for a Reference Audio file, and that the system has exited Reference Mode.