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:
May. 02, 2006
Filed:
Mar. 03, 2004
Hiroshi Sawada, Nara, JP;
Ryo Mukai, Nara, JP;
Shoko Araki, Kyotanabe, JP;
Shoji Makino, Machida, JP;
Hiroshi Sawada, Nara, JP;
Ryo Mukai, Nara, JP;
Shoko Araki, Kyotanabe, JP;
Shoji Makino, Machida, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
Signals from a plurality of sources are observed by a plurality of sensors disposed in two dimensions, and the observed signals are subject to a short-time Fourier transform, from which frequency domain signals are derived. Using the independent component analysis process on the frequency domain signals, separation matrices are produced, and an inverse matrix of each separation matrix is calculated. The direction of each source is calculated based on a ratio of a pair of elements in each column of the inverse matrix.