声掩蔽系统的研究

Research on Acoustic Masking System

为了防止保密会议室的声信息泄漏,设计了一种自适应声掩蔽系统,主要有声掩蔽主机、声音采集器、报警器和干扰器,主机控制各部分信息传递,声音采集器对会议室内声音进行集合经验模态分解和A计权拟合计算声压进行监控,使干扰器播放掩蔽声的声压自动调节,防止掩蔽效果随着被掩蔽声声压增加而下降,当会议室内声压过高时,报警器报警提示,本系统还采用新的掩蔽声即混合声作为掩蔽声,是混合了两种噪声产生的,掩蔽效果更好。通过对系统的掩蔽效果进行主观质量评价,结果表明,本系统的掩蔽效果良好,且自适应声压调节功能可以确保保密会议室内的声音一直被掩蔽,更有效的进行保密会议室的声音防护。

To prevent acoustic information leakage of confidential conference room, a kind of adaptive noise masking system is designed, which mainly includes audio masking host, sound collector, alarm and jammer.Host controls parts information transmission, sound collector is used for empirical mode decomposition of set meeting room sound and monitoring A weighting fitting calculation of sound pressure, thus automatically adjusting masking sound pressure from the jammer broadcast, as well as preventing masking sound pressure from dropping due to the increasing masking effect, when the sound pressure of conference room is high enough, alarm will exert alarm prompt.This system also adopts the new masking, i.e.,mixed sound as sound masking, which is a mixture of two kinds of noise, the masking effect is better.Through the subjective quality evaluation test on the masking effect of the system, the results show that the masking effect of the system is good, and the adaptive sound pressure regulation function can ensure that the sound in the confidential meeting room is always masking, and the sound protection of the confidential conference room is more effective.