Aliasing Line Spectrum Recognition Method Based on Joint Processing of Sound Pressure and Acceleration
Tianxing Li, Jinrong Wu, Li Ma · 2021 OES China Ocean Acoustics (COA) · 2021
Aiming at the problem of aliasing of sound source line spectrum at low sampling rate, a spectrum estimation method based on joint processing of sound pressure and acceleration channel is proposed. According to the inherent characteristic of 90 ° phase difference between sound pressure and acceleration channel, the aliasing line spectrum in the sampling rate range is suppressed. Theoretical analysis and simulation results show that this method can effectively improve the recognition ability of aliased line spectrum, and retain the real frequency line spectrum in the range of sampling rate. The experimental results verify the effectiveness of the method.