Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo speaker arrangement
Reexamination Certificate
2005-11-01
2005-11-01
Mei, Xu (Department: 2644)
Electrical audio signal processing systems and devices
Binaural and stereophonic
Stereo speaker arrangement
C381S310000, C381S017000
Reexamination Certificate
active
06961439
ABSTRACT:
A method and apparatus for producing virtual sound sources that are externally perceived and positioned at any orientation in azimuth and elevation from a listener is described. In this system, a set of speakers is mounted in a location near the temple of a listener's head, such for example, on an eyeglass frame or inside a helmet, rather than in earphones. A head tracking system determines the location and orientation of the listener's head and provides the measurements to a computer which processes audio signals, from a audio source, in conjunction with a head related transfer function (HRTF) filter to produce spatialized audio. The HRTF filter maintains the virtual location of the audio signals/sound, thus allowing the listener to change locations and head orientation without degradation of the audio signal. The audio system of the present invention produces virtual sound sources that are externally perceived and positioned at any desired orientation in azimuth and elevation from the listener.
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Chong-Jin Tan et al., Direct Concha Excitation for the Introduction of Individualized Hearing Cues, Journal of Audio Engineering Society, Vo. 48, No. 7/8; Jul.-Aug., 2000.
Karasek John J.
Mei Xu
Robbins Thomas D.
The United States of America as represented by the Secretary of
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