Abstract: Aimed at the filtering problem of particle impact noise detection(PIND) signal in aerospace product automatic detection system of remainders, a new filtering method based on Normalized Least Mean Square (NLMS) adaptive filter is presented. This new filter is designed to eliminate the noise background of turntable and vibration table. Through the application of this new filtering method the particle impact noise detection signal can be abstracted efficentively. This new filter method is verified via computer simulation and real PIND signal processing.

Key words: particle impact noise, detection of remainders, automatic adaptive filter, signal processing