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:
Jul. 27, 2021
Filed:
Sep. 13, 2016
Pioneer Corporation, Tokyo, JP;
Tohoku Pioneer Corporation, Yamagata, JP;
Satoru Hiwatari, Yamagata, JP;
Hiroyuki Dohi, Yamagata, JP;
Koji Takayama, Yamagata, JP;
Hiroyuki Kobayashi, Yamagata, JP;
PIONEER CORPORATION, Tokyo, JP;
TOHOKU PIONEER CORPORATION, Yamagata, JP;
Abstract
Provided is a sound generation device wherein noise can be reduced in accordance with a predetermined frequency band. An elastic member () is provided to obtain a sound pressure characteristic having a sub-peak at a predetermined frequency on the lower side than a lowest resonance frequency, and a phase characteristic such that a change rate of phase difference is lowered around the predetermined frequency. When the phase characteristic is calculated by simulation or actually measured in advance and an input signal is controlled such that the generated sound has an opposite phase to the noise, the generated sound can be made less prone to deviate from the opposite phase to the noise even if a time difference is caused between noise sound collection and sound generation at around the predetermined frequency, with the result that the noise can be effectively reduced. In addition, restrictions regarding the equivalent mass and resonance frequency of a diaphragm () can be reduced, the flexibility of design can be improved, and the noise can be reduced in accordance with the predetermined frequency band.