The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 27, 2007
Filed:
Mar. 17, 1999
Alastair Sibbald, Maidenhead, GB;
Richard David Clemow, Gerrards Cross, GB;
Fawad Nackvi, Southall, GB;
Alastair Sibbald, Maidenhead, GB;
Richard David Clemow, Gerrards Cross, GB;
Fawad Nackvi, Southall, GB;
Creative Technology Ltd, Singapore, SG;
Abstract
A method of improving 3D sound reproduction is described, in which virtual sound sources to be positioned behind a listenerare 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 sphereare 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.