声景中声掩蔽效应导向的规划设计

声掩蔽效应在新兴的声景研究和设计中得到了广泛的发展和应用。自然声可以通过声掩蔽降低人们对城市噪声的感知。研究采用听音测试和噪声图模拟的方法,旨在探讨何种物理环境因素可对声景中的声掩蔽产生显著影响,以及利用规划设计手段增强积极声掩蔽效应的途径。研究表明,通过调整特定的可控城市形态参数值可降低噪声传播,扩大自然声的影响范围,增强积极声掩蔽效应,实现规划设计的整体优化。

掩蔽声系统的研究与开发

针对综合办公室的敞开式布局，使相邻工作单元之间存在着相互干扰和谈话保密性差等问题，依据声掩蔽效应理论和产生伪随机信号的递椎理论，提出了利用单片机和微电子技术开发新的掩蔽声源及其系统的方法．结果表明，该掩蔽声系统可消除噪声干扰，达到语音保密的目的．

A speech enhancement algorithm to reduce noise and compensate for partial masking effect

To enhance the speech quality that is degraded by environmental noise,an algorithm was proposed to reduce the noise and reinforce the speech.The minima controlled recursive averaging(MCRA) algorithm was used to estimate the noise spectrum and the partial masking effect which is one of the psychoacoustic properties was introduced to reinforce speech.The performance evaluation was performed by comparing the PESQ(perceptual evaluation of speech quality) and segSNR(segmental signal to noise ratio) by the proposed algorithm with the conventional algorithm.As a result,average PESQ by the proposed algorithm was higher than the average PESQ by the conventional noise reduction algorithm and segSNR was higher as much as 3.2 dB in average than that of the noise reduction algorithm.