Performance E-learning 3 article 3 Deep learning 2 Light transmission 2 Nondestructive examination 2 Real- time 2 Signal to noise ratio 2 deep learning 2 human 2 Application programs 1 Audio acoustics 1 Audio processing 1 Audio recordings 1 Automated defect recognition 1 Automation 1 Back Propagation 1 Backpropagation 1 Bit error rate 1 Bit-error rate 1 Computer technology 1 Condition 1 Contrast-to-noise ratio 1 Costs 1 Cross-phase modulations 1 Data acquisition 1 Data storage 1 Defect recognition 1 Defects 1 Detection methods 1