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Effect of Spatial Separation in Azimuth on the Threshold of Forward Masking in Time Domain
Author(s): 
Pages: 35-40
Year: Issue:  7
Journal: AUDIO ENGINEERING

Keyword:  向前掩蔽掩蔽阈值较优耳效应双耳效应;
Abstract: 从实验上探讨了掩蔽和被掩蔽声源在水平面方向分离时的向前掩蔽效应,并与单扬声器重发方式作比较,得到了这2种情况下3种频率的被掩蔽纯音信号(250 Hz,1 170 Hz,4 000Hz)的掩蔽阈值随掩蔽窄带噪声5种声压级(30 dB,40 dB,50 dB,60 dB,70 dB)变化的曲线.实验结果表明:声源空间分离时,除了个别情况外,掩蔽阈值都比单扬声器重发时有较大幅度的降低.文中进一步指出掩蔽阈值的降低是较优耳效应和双耳效应等的综合作用造成的.因此掩蔽声和被掩蔽声在空间上的分离会削弱向前时域掩蔽的作用,这一结论可为将来改进音频压缩算法提供理论基础.
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