By Combining acoustics with electrics, and based on sound pressure level a calculating method was presented to determine the magnititude of electric-power inputting to sound-box.

Aiming at the traffic noise problem of Lhasa, the author USES artificial neural network theory and method to predict the equivalent consecutive sound level of traffic noise in Lhasa.

This article introduces the principle of three-level center clipping autocorrelation analysis method and the difficulties in applying this method to detect the sound accuracy of piano keys.