Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo speaker arrangement
Reexamination Certificate
2007-03-27
2007-03-27
Tran, Sinh (Department: 2615)
Electrical audio signal processing systems and devices
Binaural and stereophonic
Stereo speaker arrangement
C381S309000, C381S017000
Reexamination Certificate
active
09270768
ABSTRACT:
A method of improving 3D sound reproduction is described, in which virtual sound sources to be positioned behind a listener10are filtered using an HF-cut filter in order to remove distracting high-frequency components caused by incomplete transaural crosstalk cancellation. Sound sources placed in the rearward hemisphere of reference sphere30are filtered by an amount dependent on the position of the sound source in order to provide a smooth transition between the filtered and unfiltered hemispheres. HF-cut filtering is at a maximum when the sound source is placed directly behind the listener, and is progressively reduced as the forward hemisphere is approached. The invention offers an advantage in that virtual sound images may be placed more effectively behind the listener, given improved realism of 3D effects.
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Clemow Richard David
Nackvi Fawad
Sibbald Alastair
Creative Technology Ltd
Sellers Daniel R.
Swerdon Russell N.
Tran Sinh
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