zhenqing, 1995, A Split Spectrum approach to strength thick crystal s ultrasonic inspection signal[J], Non-Destructive Testing, 17, 211
jiankai, 1993, Principle and method of ultrasonic inspection
keji, 1997, The principle of the acoustics signal processing and practice based on neural net, 4
guangping, 1994, Ultrasonic signal processing, Non-Destructive Testing, 16, 178
jinhui, 1995, Hidden Markov models for speech processing
10.1002/j.1538-7305.1985.tb00274.x
10.1109/5.18626