两扬声器虚拟声重放的双耳声压控制与定位性能

在两扬声器虚拟声重放中，通过精确重构双耳声压而产生不同的空间听觉感知。其重放的定位性能应该是由双耳声压控制的代价和稳定性所共同决定的。过去研究主要对双耳声压控制的稳定性进行分析，并以此作为扬声器布置和信号处理的依据。该文研究表明仅对双耳声压的稳定性分析是不足以完全衡量扬声器虚拟声重放的定位性能的。进一步采用虚拟声信号处理滤波器响应平均功率对双耳声压控制的代价进行分析。结果表明，缩窄左右对称扬声器布置的张角或采用非对称扬声器布置会明显增加产生侧向目标虚拟源时的双耳声压控制代价。虚拟源(虚拟声像)定位实验表明，双耳声压控制代价增加会引起虚拟源定位缺陷。实际应用中，为了有效产生侧向虚拟源，应避免采用过窄张角(如立体声偶极)和非对称的扬声器布置。

Binaural sound pressure control and localization performance in virtual sound reproduction using two loudspeakers

In virtual sound reproduction via two loudspeakers, binaural pressures are controlled by two loudspeakers to create various spatial auditory perceptions. Localization performance in reproduction is determined by the stability and effort of binaural pressure control. Stability in binaural pressure control is analyzed in previous studies to provide the basis for the design of loudspeaker configuration and signal processing. It is indicated in present work that analysis on the stability only is not enough to evaluate the localization performance in reproduction completely. The effort of binaural pressure control is further analyzed using the average power of filters of virtual sound signal processing. Results indicate that symmetric loudspeaker configurations with narrow span angle and asymmetric loudspeaker configuration increase the effort of binaural pressure control for lateral virtual source. Virtual source localization experiment indicates that an increase of the effort of binaural pressure control leads to localization defect. In practice, to recreate lateral virtual source in reproduction effectively, symmetric loudspeaker configurations with narrow span angle (such as stereo dipole) and asymmetric loudspeaker configuration should be avoided.