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. 10, 2022
Filed:
Feb. 05, 2021
Yamaha Corporation, Hamamatsu, JP;
Yu Tsuchihashi, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A headphone includes an electro-acoustic transducer, a housing, a noise cancelling circuit, a resonant frequency converter, and a switch. The electro-acoustic transducer is configured to reproduce sound from electrical signals. The housing is attached to the electro-acoustic transducer. The noise cancelling circuit is configured to attenuate a noise sound by adding an antiphase sound to the noise sound. The resonant frequency converter is configured to change a resonant frequency of a Helmholtz resonator configured to include a cavity in the housing and a tubular cavity communicating with the cavity. The switch is configured to perform alteration of the resonant frequency and switching of the noise cancelling circuit, in conjunction with each other.