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:
Jun. 23, 2026
Filed:
Jul. 20, 2021
Ntt, Inc., Tokyo, JP;
NTT, Inc., Tokyo, JP;
Abstract
A technique for accurately measuring acoustic characteristics of a parametric array is provided. A first calculation unit that calculates a complex amplitude d of an optical phase at a frequency ffrom an amount of change φof the optical phase caused by demodulated sound S, assuming that q(ξ', η′) is a function defined using a Gaussian beam expansion method, a second calculation unit that calculates a function value q(ξ, η) at a point X and a line integral value ∫q(ξ′, η)dξ′ of the function q(ξ′, η) along the optical path L, and a third calculation unit that calculates a complex amplitude p of the demodulated sound with the frequency fat the point X using the complex amplitude d, the function value q(ξ, η), and the line integral value ∫q(ξ′, η)dξ′ are included.