【摘要】 讨论了一种语音通信中的有源噪声抵消技术,该技术可以提高移动语音通信的私密性。将人头等效成刚性球体,并将人嘴等效成活塞辐射,计算了人头散射声场和人嘴辐射声场,同时通过在人头周围放置控制声源控制人嘴辐射声场,声场分析计算和实验结果表明,该技术能有效控制人嘴向外辐射的声场能量,一定程度上提升了语音通话的私密性。更多还原

【Abstract】 Active control of the voice of human speaking is considered in this paper,which may be used to improve the speech privacy by reducing the radiation of the speech power.In this paper,the human head is proximately modeled as a rigid sphere and the mouth is considered as a piston.Then the active control of free field acoustic radiation from a piston set in a rigid sphere by using a set of point sources is concerned in this paper.Analytic expression is derived,numerical simulations and experiment results show that it is possible to control the radiation from a small piston set in a rigid sphere with the size of a human head up to a certain frequency,which is possible to improve the speech privacy in public speech communication.更多还原