Patent References 3088997 3906160 Earphone construction Motion picture theater loudspeaker system Head diffraction compensated stereo system with optimal equalization Three-dimensional sight and sound reproduction apparatus for individual use Liquid crystal shutter system for stereoscopic and other applications Earphone spacer Head diffraction compensated stereo system Multi-channel sound simulation system InventorsAssigneeApplicationNo. 753259 filed on 11/21/1996US Classes:381/309, Stereo earphone381/27, Center channel381/74HEADPHONE CIRCUITSExaminersPrimary: Kuntz, CurtisAssistant: Mei, Xu Attorney, Agent or FirmForeign Patent References
International ClassH04R 005/00AbstractA head mounted surround sound virtual positioning system that includes a video recorder (200), which is operable to have disposed therein a tape (202), having a surround sound audio track associated therewith. The surround sound system is encoded on two channels, which are output to a Dolby.RTM. decoder (204), which is operable to extract the five surround sound system channels therefrom. The left front, left rear, right front and right rear channels are input to a virtual positioning system (264), which is operable to virtually position each of the speakers relative to the head of the listener (26). These signals are then combined with a combining circuit (268) to provide the virtual positioning of only two speaker lines (58) and (60), disposed adjacent the right and left ears of the listener (26). The speakers (58) and (60) are disposed on the head mounted system such that they are fixed relative to the ear of the listener and slightly forward of the ears and adjacent the head. The center speaker signal output of the decoder (204) is output from a separate external speaker (310). | |