Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo speaker arrangement
Reexamination Certificate
2006-08-01
2006-08-01
Nguyen, Duc (Department: 2643)
Electrical audio signal processing systems and devices
Binaural and stereophonic
Stereo speaker arrangement
C381S001000, C381S017000
Reexamination Certificate
active
07085393
ABSTRACT:
The present invention provides an improved HRTF modeling technique for synthesizing HRTFs with varying degrees of smoothness and generalization. A plurality N of spatial characteristic function sets are regularized or smoothed before combination with corresponding Eigen filter functions, and summed to provide an HRTF (or HRIR) filter having improved smoothness in a continuous auditory space. A trade-off is allowed between accuracy in localization and smoothness by controlling the smoothness level of the regularizing models with a lambda factor. Improved smoothness in the HRTF filter allows the perception by the listener of a smoothly moving sound rendering free of annoying discontinuities creating clicks in the 3D sound.
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Richard A. Reale, et al., “Am Implementation of Virtual Acoustic Space for Neurophysiological Studies of Directional Hearing,” Virtual Auditory Space: Generation and Applications, Chapter 5, 1996, pp. 153-183.
Agere Systems Inc.
Nguyen Duc
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