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:
Dec. 31, 2024
Filed:
Feb. 25, 2022
The Ritsumeikan Trust, Kyoto, JP;
Takanobu Nishiura, Shiga, JP;
THE RITSUMEIKAN TRUST, Kyoto, JP;
Abstract
A parametric array loudspeakerincludes: a plurality of ultrasonic wave generating elementsA,B arranged in a first direction R; and a modulation circuitconfigured to generate a modulation signal in which audible sound is modulated with a carrier wave. The plurality of ultrasonic wave generating elements include a first ultrasonic wave generating elementA included in a first area being at least one side of both end areas in the first direction, and a second ultrasonic wave generating elementB included in a second area present between the both end areas. The modulation circuit generates a first modulation signal SGto be provided to the first ultrasonic wave generating element and a second modulation signal SGto be provided to the second ultrasonic wave generating element. The first modulation signal is a signal in which the phase of at least one of the carrier wave and a sideband wave of the second modulation signal is shifted by a predetermined phase shift amount.