Baseband Distortion Modeling for a Parametric Loudspeaker System Using Volterra Kernels
A directional sound beam can be generated by a parametric loudspeaker system through the nonlinear interaction between finite-amplitude ultrasonic waves in air. However, this nonlinear interaction also produces harmonic components in addition to the desired audible sound. In order to investigate this nonlinear phenomenon, a baseband distortion model is developed from nonlinear system identification using Volterra kernels along with results obtained from both numerical simulations and experimental measurements that take into account the emitter’s response. A nonlinear model with reduced complexity to the 2nd-order Volterra kernel is found to agree with the mathematical model. Based on this model, we can predict the total harmonic distortion (THD) in the far field and perform predistortion technique to remove it.
Wei Ji Ee-leng Tan Woon-Seng Gan
Digital Signal Processing Laboratory, School of Electrical and Electronic Engineering Nanyang Techno Digital Signal Processing Laboratory, School of Electrical and Electronic EngineeringNanyang Technol
国际会议
2011亚太信号与信息处理协会年度峰会(APSIPAASC 2011)
西安
英文
1-5
2011-10-18（万方平台首次上网日期，不代表论文的发表时间）