频率对环绕声声像定位的影响

本文考虑双耳相位差的高级近似，导出了中频情况下适用的具有更普遍意义的平面环绕声声像定位公式。在低频时该式将化为通常的环绕声声像定位公式，而随着声音频率的增加，声像位置将与频率有关。将新的公式用到方型排列和棱型排列的４－４－４环绕声系统，得到了同实验相一致的结果。文中着重指出，声像随频率而变化是导致环绕声重发中侧向声像不稳定的重要在而为今后改进环绕声系统提供了理论基础。

The effect of frequency on image localization in the surround sound systems

By considering the higher approximation of binaural phase difference, a more general localization equation for surround sound image which is applicable to mid-frequencies is derived. At low frequencies this equation simplifies to the localiztion equation currently in use. But as the frequency increases, the position of sound image is dependent on frequency. The new equation is used to analyze the rectangle and the rhonb 4-4-4 loudspeaker layout surround sound systems, and the theoretical result is found to be consistent with the experimental. It is emphasized that variation of the image position with frequency is an important reason for image unstability in surround sound reproduction. This conclusion affords a theoretical basis for improving the surround sound system in future.