Patent Number: 7,085,393

Title: Method and apparatus for regularizing measured HRTF for smooth 3D digital audio

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.

Inventors: Chen; Jiashu (Homdel, NJ)

Assignee: Agere Systems Inc.

International Classification: H04R 5/02 (20060101)

Expiration Date: 8/01/02018