If the testing indicator is out of the thresholds, the system will send an alarm to manager to resolve the quality problem of the streaming media service as soon as possible.

The system is composed of server, network switching, appling section , test section LED indicator , signal acquisition section , testing and controlling section and signal processing section etc.

An damage indicator was defined to determine the location of structural damage elements, and the proper testing modal modes used in the inverse computation could be selected accordingly.