Abstract:Abstract: To extract the time-frequency information of ultrasonic cavitation and estimate the intensity of the cavitation simply and effectively, the all-poles linear predictive coding model based formant method is introduced; and the method has been applied to analyzed the acoustic emission signals of a cavitation field caused by 19 kHz ultrasound. The comparison study shows that it is more capable of extracting simple but important time-frequency information from the acoustic emission signals than spectrum method and short time Fourier transformation (STFT) method. The results of the signals’ formant analysis shows some formant parameters of the acoustic emission signals, such as the fundamental frequency and higher frequency formant’s amplitude, can be used to describe the intensity of ultrasonic cavitation’s nonlinear oscillation and transient cavitation, thus to estimate the intensity of ultrasonic cavitation.