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:
Oct. 15, 2002
Filed:
Jun. 29, 1999
Seigou Yasuda, Kanagawa, JP;
Masao Kasuga, Tochigi, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A method of determining a sound localization filter for approximation of a head related transfer function. The method comprises storing a plurality of sets of initial parameters with respect to a plurality of predetermined direction angles about a front position of a listener into a memory, reading one of the sets of initial parameters from the memory in accordance with a localization shift signal, calculating an optimum filter parameter based on the read initial parameters, the optimum filter parameter needed to approximate desired frequency characteristics of the head related transfer function, determining filter coefficients of the sound localization filter based on the optimum filter parameter and supplying the determined filter coefficients to a coefficient buffer provided for the sound localization filter.