Sound Spatialization over Loudspeakers: A Real-Time Implementation Using Head-Related Transfer Functions

Head-related transfer functions (HRTFs) can be utilized to enhance sound spatialization over a 4-channel loudspeaker system. While the illusion of multidimensional sound can be easily synthesized in a stereo headset using HRTFs, playback over loudspeakers introduces difficulties that reduce the quality of the illusion. Interaural crosstalk, room reflections, and head move- ments are detrimental to the image, and a good playback system should minimize these effects. An algorithm was developed that incorporates HRTFs from the desired image angle along with HRTFs from the loudspeaker locations to enhance spatialization. This algorithm was implemented as a 4-channel VST plugin, a system that allows real-time processing and full automation of all parameters. Since VST plugins can be hosted in many digital audio workstations (Audacity, Cubase, Max MSP, etc.), no specialized hardware is required other than 4-channel IO capability. Subjective listening tests were performed using the 4-channel plugin and, although there was some timbre discoloration, the use of this algorithm provided improved spatialization when compared with quadraphonic panning.unpublishednot peer reviewedU of I OnlyUndergraduate senior thesis not recommended for open acces