一种用于手持式播放装置的立体声扩展方法

A scheme of stereophonic expansion for handheld sound reproduction devices

手持式播放装置的一对立体声扬声器相对倾听者的张角窄、距离近,影响立体声重放效果。针对这类应用提出了一种立体声扩展方法,它采用远场和近场头相关传输函数(HRTF)设计听觉传输滤波器并将低频信号滤除。该方法适应了近距离扬声器重放并避免了窄张角扬声器布置带来的信号处理中过分的低频提升问题。该方法不但能改善重放性能,且对计算和存储量要求较低,适合于手持式播放装置的信号处理硬件配置。声像定位实验验证了该方法的效果。

A pair of stereophonic loudspeakers in a handheld sound reproduction device usually locates at a proximal distance with respect to listener and their span angle is much less than the 60° in standard configuration,which inevitably degrades or even destroys the reproduction performance.The present work proposes a scheme of stereophonic expansion for handheld sound reproduction devices.The scheme consists of transaural filters designed on the basis of far- and near-field head-related transfer functions（HRTFs）,and adopts a high pass filter to remove the low-frequency signal.It therefore accommodates the proximal loudspeaker distance in handheld devices reproduction and avoids the excessive low-frequency gain in the outputs of transaural filters due to the narrow span of loudspeaker pair.The scheme improves the performance in reproduction.At the same time,it needs a lower computational cost and memory and thereby is suitable for handheld devices.The results of virtual source localization experiment validate the scheme.