A stereophonic image enhancement signal processing system for vehicular sound systems provides a symmetrical improvement in imaging for listeners located at the left and right regions of a vehicle passenger compartment The stereo signals are processed in a manner to provide a rapid rate-of-change of...http://www.google.com.hk/patents/US6038323?utm_source=gb-gplus-share專利 US6038323 - Stereophonic image enhancement system for use in automobiles
