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Apparent Sound Source De-Elevation Using Digital Filters Based on Human Sound Localization

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The possibility of creating an apparent sound source elevated or de-elevated from its current physical location is presented in this study. For situations where loudspeakers need to be placed in different locations than the ideal placement for accurate sound reproduction digital filters are created and connected in the audio reproduction chain either to elevate or de-elevate the perceived sound from its physical location. The filters are based on head related transfer functions (HRTF) measured in human subjects. The filters relate to the average head, ears, and torso transfer functions of humans isolating the effect of elevation/de-elevation only. Preliminary tests in a movie theater setup indicate that apparent de-elevation can be achieved perceiving about –20 degrees from its physical location.

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