通路相位差与立体声声像定位

考虑双耳根位差的高级近似,得到了具有更普遍意义的、重发通路间存在相位差时的立体声声像定位公式.在极低频或通路间相位差较小的情况下,它将简化为Makita理论的结果.但一般情况下声像位置将明显与频率有关.着重指出,在通路间存在相位差的立体声重发中,声像位置随频率而变化是导致声像展宽的主要原因.同时通路间相位差引起的附加低频对耳声级差是导致声像自然度降低的重要原因.在实际应用中,应尽量减少通路间的相位差,至少应减少到60°以下.

Interchannel Phase difference and Stereo Sound Image Localization

In this paper,by considering higher order approximation to the interaural phase difference,a more general localization equation for stereo sound image with interchannel phase difference is derived.At very low frequency or low interchannel phase difference,this equation can be simplified to the result of Makita theory.But in general condition,image position is obviously affected by frequency.It is shown that image position varing with frequency is the main reason for image width broadening in stereo reproduction with interchannel phase difference.And an extra interaural sound level difference caused by interchannel phase difference is the main reason for image naturatness degrading.In practice,it is necessary to reduce the interchannel Phase difference,at least,to less than 60°.